diff --git a/CMakeLists.txt b/CMakeLists.txt
index 65fbc686..b96bfd0d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -65,6 +65,7 @@ set(rcutils_sources
   src/shared_library.c
   src/snprintf.c
   src/split.c
+  src/strcasecmp.c
   src/strdup.c
   src/strerror.c
   src/string_array.c
@@ -401,6 +402,13 @@ if(BUILD_TESTING)
     target_link_libraries(test_snprintf ${PROJECT_NAME})
   endif()
 
+  rcutils_custom_add_gtest(test_strcasecmp
+    test/test_strcasecmp.cpp
+  )
+  if(TARGET test_strcasecmp)
+    target_link_libraries(test_strcasecmp ${PROJECT_NAME})
+  endif()
+
   rcutils_custom_add_gtest(test_uint8_array
     test/test_uint8_array.cpp
   )
diff --git a/include/rcutils/strcasecmp.h b/include/rcutils/strcasecmp.h
new file mode 100644
index 00000000..bdb90649
--- /dev/null
+++ b/include/rcutils/strcasecmp.h
@@ -0,0 +1,76 @@
+// Copyright 2020 Open Source Robotics Foundation, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef RCUTILS__STRCASECMP_H_
+#define RCUTILS__STRCASECMP_H_
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+#include "rcutils/macros.h"
+#include "rcutils/visibility_control.h"
+
+/// Case insensitive string compare.
+/**
+ * This function compares two strings ignoring case in a portable way.
+ * This performs a byte-by-byte comparison of the strings s1 and s2,
+ * ignoring the case of the characters.
+ *
+ * \param[in] s1 Null terminated string to compare.
+ * \param[in] s2 Null terminated string to compare.
+ * \param[out] value Pointer to comparison result.
+ *   An integer less than, equal to, or greater than zero if s1 is, after
+ *   ignoring case, found to be less than, to match, or be greater than s2,
+ *   respectively.
+ * \return 0 if method succeeded , -1 if failed.
+ */
+RCUTILS_PUBLIC
+RCUTILS_WARN_UNUSED
+int
+rcutils_strcasecmp(
+  const char * s1,
+  const char * s2,
+  int * value);
+
+/// Case insensitive string compare up to count characters.
+/**
+ * This function compares two strings ignoring case in a portable way.
+ * This performs a byte-by-byte comparison of the strings s1 and s2 up to count
+ * characters of s1 and s2, ignoring the case of the characters.
+ *
+ * \param[in] s1 First string to compare.
+ * \param[in] s2 Second string to compare.
+ * \param[in] n Count of characters to compare.
+ * \param[out] value Pointer to comparison result.
+ *   An integer less than, equal to, or greater than zero if s1 is, after
+ *   ignoring case, found to be less than, to match, or be greater than s2,
+ *   respectively.
+ * \return 0 if method succeeded , -1 if failed.
+ */
+RCUTILS_PUBLIC
+RCUTILS_WARN_UNUSED
+int
+rcutils_strncasecmp(
+  const char * s1,
+  const char * s2,
+  size_t n,
+  int * value);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif  // RCUTILS__STRCASECMP_H_
diff --git a/src/strcasecmp.c b/src/strcasecmp.c
new file mode 100644
index 00000000..941919a6
--- /dev/null
+++ b/src/strcasecmp.c
@@ -0,0 +1,62 @@
+// Copyright 2020 Open Source Robotics Foundation, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+#include <errno.h>
+#include <string.h>
+
+#include "rcutils/strcasecmp.h"
+
+int
+rcutils_strcasecmp(
+  const char * s1,
+  const char * s2,
+  int * value)
+{
+  if (s1 == NULL || s2 == NULL || value == NULL) {
+    return -1;
+  }
+#ifndef _WIN32
+  *value = strcasecmp(s1, s2);
+#else
+  *value = _stricmp(s1, s2);
+#endif
+  return 0;
+}
+
+int
+rcutils_strncasecmp(
+  const char * s1,
+  const char * s2,
+  size_t n,
+  int * value)
+{
+  if (s1 == NULL || s2 == NULL || value == NULL) {
+    return -1;
+  }
+#ifndef _WIN32
+  *value = strncasecmp(s1, s2, n);
+#else
+  *value = _strnicmp(s1, s2, n);
+#endif
+  return 0;
+}
+
+#ifdef __cplusplus
+}
+#endif
diff --git a/test/test_strcasecmp.cpp b/test/test_strcasecmp.cpp
new file mode 100644
index 00000000..8fc614dc
--- /dev/null
+++ b/test/test_strcasecmp.cpp
@@ -0,0 +1,195 @@
+// Copyright 2020 Open Source Robotics Foundation, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include <gtest/gtest.h>
+
+#include "rcutils/strcasecmp.h"
+
+// Tests the rcutils_strcasecmp() function.
+TEST(TestStrcasecmp, test_strcasecmp) {
+  int value;
+  EXPECT_EQ(-1, rcutils_strcasecmp(NULL, NULL, NULL));
+  EXPECT_EQ(-1, rcutils_strcasecmp(NULL, "", &value));
+  EXPECT_EQ(-1, rcutils_strcasecmp("", NULL, &value));
+  EXPECT_EQ(-1, rcutils_strcasecmp("", "", NULL));
+  EXPECT_EQ(-1, rcutils_strcasecmp(NULL, NULL, &value));
+  EXPECT_EQ(-1, rcutils_strcasecmp("", NULL, NULL));
+  EXPECT_EQ(-1, rcutils_strcasecmp(NULL, "", NULL));
+
+  EXPECT_EQ(0, rcutils_strcasecmp("", "", &value));
+  EXPECT_EQ(0, value);
+  EXPECT_EQ(0, rcutils_strcasecmp("abc", "abc", &value));
+  EXPECT_EQ(0, value);
+  EXPECT_EQ(0, rcutils_strcasecmp("ABC", "ABC", &value));
+  EXPECT_EQ(0, value);
+  EXPECT_EQ(0, rcutils_strcasecmp("1abc", "1abc", &value));
+  EXPECT_EQ(0, value);
+  EXPECT_EQ(0, rcutils_strcasecmp("abc1", "abc1", &value));
+  EXPECT_EQ(0, value);
+  EXPECT_EQ(0, rcutils_strcasecmp("1ABC", "1ABC", &value));
+  EXPECT_EQ(0, value);
+  EXPECT_EQ(0, rcutils_strcasecmp("ABC1", "ABC1", &value));
+  EXPECT_EQ(0, value);
+  EXPECT_EQ(0, rcutils_strcasecmp("ABC", "abc", &value));
+  EXPECT_EQ(0, value);
+  EXPECT_EQ(0, rcutils_strcasecmp("abc", "ABC", &value));
+  EXPECT_EQ(0, value);
+  EXPECT_EQ(0, rcutils_strcasecmp("Abc", "abc", &value));
+  EXPECT_EQ(0, value);
+  EXPECT_EQ(0, rcutils_strcasecmp("abc", "Abc", &value));
+  EXPECT_EQ(0, value);
+  EXPECT_EQ(0, rcutils_strcasecmp("Abc", "Abc", &value));
+  EXPECT_EQ(0, value);
+  EXPECT_EQ(0, rcutils_strcasecmp("aBc", "abc", &value));
+  EXPECT_EQ(0, value);
+  EXPECT_EQ(0, rcutils_strcasecmp("abc", "aBc", &value));
+  EXPECT_EQ(0, value);
+  EXPECT_EQ(0, rcutils_strcasecmp("aBc", "aBc", &value));
+  EXPECT_EQ(0, value);
+  EXPECT_EQ(0, rcutils_strcasecmp("abC", "abc", &value));
+  EXPECT_EQ(0, value);
+  EXPECT_EQ(0, rcutils_strcasecmp("abc", "abC", &value));
+  EXPECT_EQ(0, value);
+  EXPECT_EQ(0, rcutils_strcasecmp("abC", "abC", &value));
+  EXPECT_EQ(0, value);
+
+  EXPECT_EQ(0, rcutils_strcasecmp("", "abc", &value));
+  EXPECT_LT(value, 0);
+  EXPECT_EQ(0, rcutils_strcasecmp("abc", "", &value));
+  EXPECT_GT(value, 0);
+  EXPECT_EQ(0, rcutils_strcasecmp("abcd", "abc", &value));
+  EXPECT_GT(value, 0);
+  EXPECT_EQ(0, rcutils_strcasecmp("abc", "abcd", &value));
+  EXPECT_LT(value, 0);
+  EXPECT_EQ(0, rcutils_strcasecmp("abcD", "abc", &value));
+  EXPECT_GT(value, 0);
+  EXPECT_EQ(0, rcutils_strcasecmp("abc", "abcD", &value));
+  EXPECT_LT(value, 0);
+  EXPECT_EQ(0, rcutils_strcasecmp("1abc", "abc", &value));
+  EXPECT_LT(value, 0);
+  EXPECT_EQ(0, rcutils_strcasecmp("abc", "1abc", &value));
+  EXPECT_GT(value, 0);
+  EXPECT_EQ(0, rcutils_strcasecmp("abc1", "abc", &value));
+  EXPECT_GT(value, 0);
+  EXPECT_EQ(0, rcutils_strcasecmp("abc", "abc1", &value));
+  EXPECT_LT(value, 0);
+  EXPECT_EQ(0, rcutils_strcasecmp("ABCd", "abc", &value));
+  EXPECT_GT(value, 0);
+  EXPECT_EQ(0, rcutils_strcasecmp("abc", "ABCd", &value));
+  EXPECT_LT(value, 0);
+  EXPECT_EQ(0, rcutils_strcasecmp("1Abc", "abc", &value));
+  EXPECT_LT(value, 0);
+  EXPECT_EQ(0, rcutils_strcasecmp("abc", "1Abc", &value));
+  EXPECT_GT(value, 0);
+  EXPECT_EQ(0, rcutils_strcasecmp("a1Bc", "abc", &value));
+  EXPECT_LT(value, 0);
+  EXPECT_EQ(0, rcutils_strcasecmp("abc", "a1Bc", &value));
+  EXPECT_GT(value, 0);
+  EXPECT_EQ(0, rcutils_strcasecmp("ab1C", "abc", &value));
+  EXPECT_LT(value, 0);
+  EXPECT_EQ(0, rcutils_strcasecmp("abc", "ab1C", &value));
+  EXPECT_GT(value, 0);
+}
+
+// Tests the rcutils_strncasecmp() function.
+TEST(TestStrcasecmp, test_strncasecmp) {
+  int value;
+  EXPECT_EQ(-1, rcutils_strncasecmp(NULL, NULL, 0, NULL));
+  EXPECT_EQ(-1, rcutils_strncasecmp(NULL, "", 1, &value));
+  EXPECT_EQ(-1, rcutils_strncasecmp("", NULL, 1, &value));
+  EXPECT_EQ(-1, rcutils_strncasecmp("", "", 1, NULL));
+  EXPECT_EQ(-1, rcutils_strncasecmp(NULL, NULL, 0, &value));
+  EXPECT_EQ(-1, rcutils_strncasecmp("", NULL, 0, NULL));
+  EXPECT_EQ(-1, rcutils_strncasecmp(NULL, "", 0, NULL));
+
+  EXPECT_EQ(0, rcutils_strncasecmp("", "", 0, &value));
+  EXPECT_EQ(0, value);
+  EXPECT_EQ(0, rcutils_strncasecmp("", "", 1, &value));
+  EXPECT_EQ(0, value);
+  EXPECT_EQ(0, rcutils_strncasecmp("abc", "", 0, &value));
+  EXPECT_EQ(0, value);
+  EXPECT_EQ(0, rcutils_strncasecmp("", "abc", 0, &value));
+  EXPECT_EQ(0, value);
+  EXPECT_EQ(0, rcutils_strncasecmp("abc", "abc", 3, &value));
+  EXPECT_EQ(0, value);
+  EXPECT_EQ(0, rcutils_strncasecmp("ABC", "ABC", 3, &value));
+  EXPECT_EQ(0, value);
+  EXPECT_EQ(0, rcutils_strncasecmp("1abc", "1abc", 4, &value));
+  EXPECT_EQ(0, value);
+  EXPECT_EQ(0, rcutils_strncasecmp("abc1", "abc1", 4, &value));
+  EXPECT_EQ(0, value);
+  EXPECT_EQ(0, rcutils_strncasecmp("1ABC", "1ABC", 4, &value));
+  EXPECT_EQ(0, value);
+  EXPECT_EQ(0, rcutils_strncasecmp("ABC1", "ABC1", 4, &value));
+  EXPECT_EQ(0, value);
+  EXPECT_EQ(0, rcutils_strncasecmp("ABC", "abc", 1, &value));
+  EXPECT_EQ(0, value);
+  EXPECT_EQ(0, rcutils_strncasecmp("abc", "ABC", 1, &value));
+  EXPECT_EQ(0, value);
+  EXPECT_EQ(0, rcutils_strncasecmp("Abc", "abc", 2, &value));
+  EXPECT_EQ(0, value);
+  EXPECT_EQ(0, rcutils_strncasecmp("abc", "Abc", 2, &value));
+  EXPECT_EQ(0, value);
+  EXPECT_EQ(0, rcutils_strncasecmp("Abc", "Abc", 2, &value));
+  EXPECT_EQ(0, value);
+  EXPECT_EQ(0, rcutils_strncasecmp("aBc", "abc", 3, &value));
+  EXPECT_EQ(0, value);
+  EXPECT_EQ(0, rcutils_strncasecmp("abc", "aBc", 3, &value));
+  EXPECT_EQ(0, value);
+  EXPECT_EQ(0, rcutils_strncasecmp("aBc", "aBc", 3, &value));
+  EXPECT_EQ(0, value);
+  EXPECT_EQ(0, rcutils_strncasecmp("abC", "abc", 4, &value));
+  EXPECT_EQ(0, value);
+  EXPECT_EQ(0, rcutils_strncasecmp("abc", "abC", 4, &value));
+  EXPECT_EQ(0, value);
+  EXPECT_EQ(0, rcutils_strncasecmp("abC", "abC", 4, &value));
+  EXPECT_EQ(0, value);
+
+  EXPECT_EQ(0, rcutils_strncasecmp("", "abc", 1, &value));
+  EXPECT_LT(value, 0);
+  EXPECT_EQ(0, rcutils_strncasecmp("abc", "", 1, &value));
+  EXPECT_GT(value, 0);
+  EXPECT_EQ(0, rcutils_strncasecmp("abcd", "abc", 4, &value));
+  EXPECT_GT(value, 0);
+  EXPECT_EQ(0, rcutils_strncasecmp("abc", "abcd", 4, &value));
+  EXPECT_LT(value, 0);
+  EXPECT_EQ(0, rcutils_strncasecmp("abcD", "abc", 4, &value));
+  EXPECT_GT(value, 0);
+  EXPECT_EQ(0, rcutils_strncasecmp("abc", "abcD", 4, &value));
+  EXPECT_LT(value, 0);
+  EXPECT_EQ(0, rcutils_strncasecmp("1abc", "abc", 4, &value));
+  EXPECT_LT(value, 0);
+  EXPECT_EQ(0, rcutils_strncasecmp("abc", "1abc", 4, &value));
+  EXPECT_GT(value, 0);
+  EXPECT_EQ(0, rcutils_strncasecmp("abc1", "abc", 4, &value));
+  EXPECT_GT(value, 0);
+  EXPECT_EQ(0, rcutils_strncasecmp("abc", "abc1", 4, &value));
+  EXPECT_LT(value, 0);
+  EXPECT_EQ(0, rcutils_strncasecmp("ABCd", "abc", 4, &value));
+  EXPECT_GT(value, 0);
+  EXPECT_EQ(0, rcutils_strncasecmp("abc", "ABCd", 4, &value));
+  EXPECT_LT(value, 0);
+  EXPECT_EQ(0, rcutils_strncasecmp("1Abc", "abc", 4, &value));
+  EXPECT_LT(value, 0);
+  EXPECT_EQ(0, rcutils_strncasecmp("abc", "1Abc", 4, &value));
+  EXPECT_GT(value, 0);
+  EXPECT_EQ(0, rcutils_strncasecmp("a1Bc", "abc", 4, &value));
+  EXPECT_LT(value, 0);
+  EXPECT_EQ(0, rcutils_strncasecmp("abc", "a1Bc", 4, &value));
+  EXPECT_GT(value, 0);
+  EXPECT_EQ(0, rcutils_strncasecmp("ab1C", "abc", 4, &value));
+  EXPECT_LT(value, 0);
+  EXPECT_EQ(0, rcutils_strncasecmp("abc", "ab1C", 4, &value));
+  EXPECT_GT(value, 0);
+}