C string may refer to:

• Null-terminated string, known as a C string or C-style string due to its use by the C programming language
• C string handling, C functions to work with null-terminated strings
• C-string (clothing), a specific type of thong, or a brand of women shorts
• C string, a string instrument string (music)

• CString, a C string representation in the Microsoft Foundation Class Library (MFC)