"Lady Friend" is a song by the American rock band The Byrds, written by David Crosby and released as a single on July 13, 1967. The single reached #82 on the Billboard Hot 100 but failed to chart in the United Kingdom. In America and Europe the B-side of "Lady Friend" was the Chris Hillman song "Old John Robertson" but in the UK the single's B-side was changed to "Don't Make Waves", a song written by Roger McGuinn and Chris Hillman. The version of "Old John Robertson" found on the B-side of "Lady Friend" is a substantially different mix from the version that would later appear on The Notorious Byrd Brothers album. "Lady Friend" is notable for being the only song penned solely by David Crosby to appear on the A-side of a Byrds' single.