diff --git a/packages/ilios-common/addon-test-support/ilios-common/page-objects/components/dashboard/terms-calendar-filter.js b/packages/ilios-common/addon-test-support/ilios-common/page-objects/components/dashboard/terms-calendar-filter.js
new file mode 100644
index 0000000000..27bb60bc35
--- /dev/null
+++ b/packages/ilios-common/addon-test-support/ilios-common/page-objects/components/dashboard/terms-calendar-filter.js
@@ -0,0 +1,16 @@
+import { collection, clickable, create, property, text } from 'ember-cli-page-object';
+
+const definition = {
+  scope: '[data-test-vocabulary-filter]',
+  vocabularies: collection('[data-test-dashboard-selected-vocabulary]', {
+    title: text('[data-test-title]'),
+    terms: collection('[data-test-selected-term-tree]', {
+      title: text(),
+      toggle: clickable('[data-test-target]'),
+      isChecked: property('checked', '[data-test-target] input'),
+    }),
+  }),
+};
+
+export default definition;
+export const component = create(definition);
diff --git a/packages/ilios-common/addon/components/dashboard/calendar-filters.gjs b/packages/ilios-common/addon/components/dashboard/calendar-filters.gjs
index f2a91809ed..da9933c73e 100644
--- a/packages/ilios-common/addon/components/dashboard/calendar-filters.gjs
+++ b/packages/ilios-common/addon/components/dashboard/calendar-filters.gjs
@@ -9,8 +9,8 @@ import FilterCheckbox from 'ilios-common/components/dashboard/filter-checkbox';
 import includes from 'ilios-common/helpers/includes';
 import { fn } from '@ember/helper';
 import FaIcon from 'ilios-common/components/fa-icon';
-import SelectedVocabulary from 'ilios-common/components/dashboard/selected-vocabulary';
 import CohortCalendarFilter from 'ilios-common/components/dashboard/cohort-calendar-filter';
+import TermsCalendarFilter from 'ilios-common/components/dashboard/terms-calendar-filter';
 
 export default class DashboardCalendarFiltersComponent extends Component {
   @service dataLoader;
@@ -93,27 +93,12 @@ export default class DashboardCalendarFiltersComponent extends Component {
             {{/if}}
           </div>
         </div>
-        <div class="calendar-filter-list vocabularyfilter" data-test-vocabulary-filter>
-          <h2>
-            {{t "general.terms"}}
-          </h2>
-          <div class="filters">
-            {{#if this.vocabulariesLoaded}}
-              <ul>
-                {{#each this.vocabularies as |vocabulary|}}
-                  <SelectedVocabulary
-                    @selectedTermIds={{@selectedTermIds}}
-                    @vocabulary={{vocabulary}}
-                    @add={{@addTermId}}
-                    @remove={{@removeTermId}}
-                  />
-                {{/each}}
-              </ul>
-            {{else}}
-              <FaIcon @icon="spinner" @spin={{true}} />
-            {{/if}}
-          </div>
-        </div>
+        <TermsCalendarFilter
+          @addTermId={{@addTermId}}
+          @removeTermId={{@removeTermId}}
+          @selectedTermIds={{@selectedTermIds}}
+          @vocabularies={{this.vocabularies}}
+        />
       {{else}}
         <div
           id="calendar-sessiontypefilter"
diff --git a/packages/ilios-common/addon/components/dashboard/selected-vocabulary.gjs b/packages/ilios-common/addon/components/dashboard/selected-vocabulary.gjs
index a081394923..16ccf6cefc 100644
--- a/packages/ilios-common/addon/components/dashboard/selected-vocabulary.gjs
+++ b/packages/ilios-common/addon/components/dashboard/selected-vocabulary.gjs
@@ -1,6 +1,8 @@
 import Component from '@glimmer/component';
 import { cached } from '@glimmer/tracking';
 import { TrackedAsyncData } from 'ember-async-data';
+import { fn } from '@ember/helper';
+import inViewport from 'ember-in-viewport/modifiers/in-viewport';
 import sortBy from 'ilios-common/helpers/sort-by';
 import SelectedTermTree from 'ilios-common/components/dashboard/selected-term-tree';
 
@@ -14,8 +16,22 @@ export default class DashboardSelectedVocabularyComponent extends Component {
     return this.topLevelTermsData.isResolved ? this.topLevelTermsData.value : [];
   }
   <template>
-    <li data-test-dashboard-selected-vocabulary>
-      <h3 data-test-title>
+    <li
+      {{inViewport
+        onEnter=(fn @addVocabularyInView @vocabulary.title)
+        onExit=(fn @removeVocabularyInView @vocabulary.title)
+        viewportSpy=true
+      }}
+      data-test-dashboard-selected-vocabulary
+    >
+      <h3
+        data-test-title
+        {{inViewport
+          onEnter=(fn @addTitleInView @vocabulary.title)
+          onExit=(fn @removeTitleInView @vocabulary.title)
+          viewportSpy=true
+        }}
+      >
         {{@vocabulary.title}}
       </h3>
       {{#each (sortBy "title" this.topLevelTerms) as |term|}}
diff --git a/packages/ilios-common/addon/components/dashboard/terms-calendar-filter.gjs b/packages/ilios-common/addon/components/dashboard/terms-calendar-filter.gjs
new file mode 100644
index 0000000000..262b1ede88
--- /dev/null
+++ b/packages/ilios-common/addon/components/dashboard/terms-calendar-filter.gjs
@@ -0,0 +1,83 @@
+import Component from '@glimmer/component';
+import { tracked } from '@glimmer/tracking';
+import { action } from '@ember/object';
+import { service } from '@ember/service';
+import t from 'ember-intl/helpers/t';
+import LoadingSpinner from 'ilios-common/components/loading-spinner';
+import SelectedVocabulary from 'ilios-common/components/dashboard/selected-vocabulary';
+
+export default class DashboardTermsCalendarFilterComponent extends Component {
+  @service dataLoader;
+  @service iliosConfig;
+
+  @tracked vocabulariesInView = [];
+  @tracked titlesInView = [];
+
+  @action
+  addVocabularyInView(vocabulary) {
+    if (!this.vocabulariesInView.includes(vocabulary)) {
+      this.vocabulariesInView = [...this.vocabulariesInView, vocabulary];
+    }
+  }
+  @action
+  removeVocabularyInView(vocabulary) {
+    this.vocabulariesInView = this.vocabulariesInView.filter(
+      (theVocabulary) => theVocabulary !== vocabulary,
+    );
+  }
+  @action
+  addTitleInView(title) {
+    if (!this.titlesInView.includes(title)) {
+      this.titlesInView = [...this.titlesInView, title];
+    }
+  }
+  @action
+  removeTitleInView(title) {
+    this.titlesInView = this.titlesInView.filter((theTitle) => theTitle !== title);
+  }
+
+  get vocabularyWithoutTitleView() {
+    const vocabulariesWithNoTitle = this.vocabulariesInView.filter(
+      (vocabulary) => !this.titlesInView.includes(vocabulary),
+    );
+    const expandedVocabulariesWithNoTitle = vocabulariesWithNoTitle.filter((vocabulary) =>
+      this.vocabulariesInView.includes(vocabulary),
+    );
+
+    if (expandedVocabulariesWithNoTitle.length) {
+      return expandedVocabulariesWithNoTitle[0];
+    }
+
+    return null;
+  }
+  <template>
+    <div class="calendar-filter-list vocabularyfilter" data-test-vocabulary-filter>
+      <h2>
+        {{t "general.terms"}}
+        {{#if this.vocabularyWithoutTitleView}}
+          ({{this.vocabularyWithoutTitleView}})
+        {{/if}}
+      </h2>
+      <div class="filters">
+        {{#if @vocabularies}}
+          <ul>
+            {{#each @vocabularies as |vocabulary|}}
+              <SelectedVocabulary
+                @selectedTermIds={{@selectedTermIds}}
+                @vocabulary={{vocabulary}}
+                @add={{@addTermId}}
+                @remove={{@removeTermId}}
+                @addVocabularyInView={{this.addVocabularyInView}}
+                @removeVocabularyInView={{this.removeVocabularyInView}}
+                @addTitleInView={{this.addTitleInView}}
+                @removeTitleInView={{this.removeTitleInView}}
+              />
+            {{/each}}
+          </ul>
+        {{else}}
+          <LoadingSpinner />
+        {{/if}}
+      </div>
+    </div>
+  </template>
+}
diff --git a/packages/ilios-common/app/components/dashboard/terms-calendar-filter.js b/packages/ilios-common/app/components/dashboard/terms-calendar-filter.js
new file mode 100644
index 0000000000..b962a69f51
--- /dev/null
+++ b/packages/ilios-common/app/components/dashboard/terms-calendar-filter.js
@@ -0,0 +1 @@
+export { default } from 'ilios-common/components/dashboard/terms-calendar-filter';
diff --git a/packages/test-app/tests/integration/components/dashboard/selected-vocabulary-test.gjs b/packages/test-app/tests/integration/components/dashboard/selected-vocabulary-test.gjs
index d3da01c5e4..8446c29550 100644
--- a/packages/test-app/tests/integration/components/dashboard/selected-vocabulary-test.gjs
+++ b/packages/test-app/tests/integration/components/dashboard/selected-vocabulary-test.gjs
@@ -41,6 +41,10 @@ module('Integration | Component | dashboard/selected-vocabulary', function (hook
           @selectedTermIds={{this.selectedTermIds}}
           @add={{(noop)}}
           @remove={{(noop)}}
+          @addVocabularyInView={{(noop)}}
+          @removeVocabularyInView={{(noop)}}
+          @addTitleInView={{(noop)}}
+          @removeTitleInView={{(noop)}}
         />
       </template>,
     );
@@ -68,6 +72,10 @@ module('Integration | Component | dashboard/selected-vocabulary', function (hook
           @selectedTermIds={{(array)}}
           @add={{this.add}}
           @remove={{(noop)}}
+          @addVocabularyInView={{(noop)}}
+          @removeVocabularyInView={{(noop)}}
+          @addTitleInView={{(noop)}}
+          @removeTitleInView={{(noop)}}
         />
       </template>,
     );
@@ -88,6 +96,10 @@ module('Integration | Component | dashboard/selected-vocabulary', function (hook
           @selectedTermIds={{this.selectedTermIds}}
           @add={{(noop)}}
           @remove={{this.remove}}
+          @addVocabularyInView={{(noop)}}
+          @removeVocabularyInView={{(noop)}}
+          @addTitleInView={{(noop)}}
+          @removeTitleInView={{(noop)}}
         />
       </template>,
     );
diff --git a/packages/test-app/tests/integration/components/dashboard/terms-calendar-filter-test.gjs b/packages/test-app/tests/integration/components/dashboard/terms-calendar-filter-test.gjs
new file mode 100644
index 0000000000..d5edf93f41
--- /dev/null
+++ b/packages/test-app/tests/integration/components/dashboard/terms-calendar-filter-test.gjs
@@ -0,0 +1,181 @@
+import { module, test } from 'qunit';
+import { setupRenderingTest } from 'test-app/tests/helpers';
+import { render } from '@ember/test-helpers';
+import { setupMirage } from 'test-app/tests/test-support/mirage';
+import { component } from 'ilios-common/page-objects/components/dashboard/terms-calendar-filter';
+import { a11yAudit } from 'ember-a11y-testing/test-support';
+import TermsCalendarFilter from 'ilios-common/components/dashboard/terms-calendar-filter';
+import noop from 'ilios-common/helpers/noop';
+import { array } from '@ember/helper';
+
+module('Integration | Component | dashboard/terms-calendar-filter', function (hooks) {
+  setupRenderingTest(hooks);
+  setupMirage(hooks);
+
+  hooks.beforeEach(async function () {
+    this.school = this.server.create('school');
+    this.vocab1 = this.server.create('vocabulary', {
+      school: this.school,
+      active: true,
+    });
+    const term1 = this.server.create('term', {
+      vocabulary: this.vocab1,
+      active: true,
+    });
+    const term2 = this.server.create('term', {
+      vocabulary: this.vocab1,
+      active: true,
+    });
+    this.vocab2 = this.server.create('vocabulary', {
+      school: this.school,
+      active: true,
+    });
+    const term3 = this.server.create('term', {
+      vocabulary: this.vocab2,
+      active: true,
+    });
+    const term4 = this.server.create('term', {
+      vocabulary: this.vocab2,
+      active: true,
+    });
+    this.server.create('course', {
+      year: 2024,
+      school: this.school,
+      terms: [term1, term2],
+    });
+    this.server.create('course', {
+      year: 2025,
+      school: this.school,
+      terms: [term3, term4],
+    });
+
+    this.vocabModel1 = await this.owner
+      .lookup('service:store')
+      .findRecord('vocabulary', this.vocab1.id);
+    this.vocabModel2 = await this.owner
+      .lookup('service:store')
+      .findRecord('vocabulary', this.vocab2.id);
+  });
+
+  test('it renders and is accessible', async function (assert) {
+    await render(
+      <template>
+        <TermsCalendarFilter
+          @addTermId={{(noop)}}
+          @removeTermId={{(noop)}}
+          @vocabularies={{array this.vocabModel1 this.vocabModel2}}
+        />
+      </template>,
+    );
+
+    assert.strictEqual(component.vocabularies.length, 2, 'vocabulary count is correct');
+    assert.strictEqual(
+      component.vocabularies[0].title,
+      'Vocabulary 1',
+      'first vocabulary title is correct',
+    );
+    assert.strictEqual(
+      component.vocabularies[1].title,
+      'Vocabulary 2',
+      'second vocabulary title is correct',
+    );
+
+    assert.strictEqual(
+      component.vocabularies[0].terms.length,
+      2,
+      'first vocabulary terms count is correct',
+    );
+    assert.strictEqual(
+      component.vocabularies[0].terms[0].title,
+      'term 0',
+      'first vocabulary, first term title is correct',
+    );
+    assert.strictEqual(
+      component.vocabularies[0].terms[1].title,
+      'term 1',
+      'first vocabulary, second term title is correct',
+    );
+
+    assert.strictEqual(
+      component.vocabularies[1].terms.length,
+      2,
+      'second vocabulary terms count is correct',
+    );
+    assert.strictEqual(
+      component.vocabularies[1].terms[0].title,
+      'term 2',
+      'second vocabulary, first term title is correct',
+    );
+    assert.strictEqual(
+      component.vocabularies[1].terms[1].title,
+      'term 3',
+      'second vocabulary, second term title is correct',
+    );
+
+    await a11yAudit(this.element);
+    assert.ok(true, 'no a11y errors found!');
+  });
+
+  test('selected terms are checked', async function (assert) {
+    await render(
+      <template>
+        <TermsCalendarFilter
+          @selectedTermIds={{array "2" "3"}}
+          @addTermId={{(noop)}}
+          @removeTermId={{(noop)}}
+          @vocabularies={{array this.vocabModel1 this.vocabModel2}}
+        />
+      </template>,
+    );
+    assert.strictEqual(component.vocabularies[0].terms.length, 2);
+
+    assert.strictEqual(component.vocabularies[0].terms[0].title, 'term 0');
+    assert.notOk(component.vocabularies[0].terms[0].isChecked);
+
+    assert.strictEqual(component.vocabularies[0].terms[1].title, 'term 1');
+    assert.ok(component.vocabularies[0].terms[1].isChecked);
+
+    assert.strictEqual(component.vocabularies[1].terms[0].title, 'term 2');
+    assert.ok(component.vocabularies[1].terms[0].isChecked);
+
+    assert.strictEqual(component.vocabularies[1].terms[1].title, 'term 3');
+    assert.notOk(component.vocabularies[1].terms[1].isChecked);
+  });
+
+  test('selected terms toggle remove', async function (assert) {
+    assert.expect(2);
+    this.set('remove', (id) => {
+      assert.strictEqual(id, '1');
+    });
+    await render(
+      <template>
+        <TermsCalendarFilter
+          @selectedTermIds={{array "1"}}
+          @addTermId={{(noop)}}
+          @removeTermId={{this.remove}}
+          @vocabularies={{array this.vocabModel1 this.vocabModel2}}
+        />
+      </template>,
+    );
+    assert.ok(component.vocabularies[0].terms[0].isChecked);
+    await component.vocabularies[0].terms[0].toggle();
+  });
+
+  test('unselected terms toggle add', async function (assert) {
+    assert.expect(2);
+    this.set('add', (id) => {
+      assert.strictEqual(id, '1');
+    });
+    await render(
+      <template>
+        <TermsCalendarFilter
+          @addTermId={{this.add}}
+          @removeTermId={{(noop)}}
+          @vocabularies={{array this.vocabModel1 this.vocabModel2}}
+        />
+      </template>,
+    );
+    assert.notOk(component.vocabularies[0].terms[0].isChecked);
+    await component.vocabularies[0].terms[0].toggle();
+  });
+});