diff --git a/libc/include/string.h b/libc/include/string.h
index aff7a35b..19f835c4 100644
--- a/libc/include/string.h
+++ b/libc/include/string.h
@@ -1,4 +1,4 @@
-/* string.h: String manipulation. */
+/* string.h: String and memory manipulation. */
 
 #ifndef _STRING_H
 #define _STRING_H
@@ -89,6 +89,12 @@ extern "C"
     /* Locate a string (needle) in another one (haystack). */
     char* strstr(const char* haystack, const char* needle);
 
+    /* Compare two null-terminated strings, ignoring case. */
+    int strcasecmp(const char* a, const char* b);
+
+    /* Compare two fixed-size null-terminated strings, ignoring case. */
+    int strncasecmp(const char* a, const char* b, size_t max);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/libc/include/strings.h b/libc/include/strings.h
new file mode 100644
index 00000000..def7de10
--- /dev/null
+++ b/libc/include/strings.h
@@ -0,0 +1,23 @@
+/* strings.h: String operations. */
+
+#ifndef _STRINGS_H
+#define _STRINGS_H
+
+#include <sys/types.h>
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+    /* Compare two null-terminated strings, ignoring case. */
+    int strcasecmp(const char* a, const char* b);
+
+    /* Compare two fixed-size null-terminated strings, ignoring case. */
+    int strncasecmp(const char* a, const char* b, size_t max);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
diff --git a/libluna/include/luna/CString.h b/libluna/include/luna/CString.h
index 13ff6855..b7ee966f 100644
--- a/libluna/include/luna/CString.h
+++ b/libluna/include/luna/CString.h
@@ -7,7 +7,7 @@ extern "C"
     void* memset(void* buf, int c, usize n);
     int memcmp(const void* a, const void* b, usize n);
     void* memmove(void* dest, const void* src, usize n);
-    void* memchr(const void* buf, int c, size_t n);
+    void* memchr(const void* buf, int c, usize n);
 
     usize strlen(const char* str);
     usize strnlen(const char* str, usize max);
@@ -41,4 +41,7 @@ extern "C"
     char* strpbrk(const char* s, const char* accept);
 
     char* strstr(const char* haystack, const char* needle);
+
+    int strcasecmp(const char* a, const char* b);
+    int strncasecmp(const char* a, const char* b, usize max);
 }
diff --git a/libluna/src/CString.cpp b/libluna/src/CString.cpp
index 3dcc4581..fc66de79 100644
--- a/libluna/src/CString.cpp
+++ b/libluna/src/CString.cpp
@@ -1,5 +1,6 @@
 #include <luna/Alloc.h>
 #include <luna/CString.h>
+#include <luna/CType.h>
 
 extern "C"
 {
@@ -297,4 +298,25 @@ extern "C"
 
         return nullptr;
     }
+
+    int strcasecmp(const char* a, const char* b)
+    {
+        while (*a && (_tolower(*a) == _tolower(*b)))
+        {
+            a++;
+            b++;
+        }
+        return _tolower(*(const u8*)a) - _tolower(*(const u8*)b);
+    }
+
+    int strncasecmp(const char* a, const char* b, usize max)
+    {
+        const char* s = a;
+        while (*a && (_tolower(*a) == _tolower(*b)) && (usize)(a - s) < (max - 1))
+        {
+            a++;
+            b++;
+        }
+        return _tolower(*(const u8*)a) - _tolower(*(const u8*)b);
+    }
 }