Andrew "Duck" MacDonald (born September 17, 1953) is an American heavy metal/hard rock guitarist, who has played in several bands, the most well-known of which being Blue Cheer.

MacDonald met with ex-Elf/Rainbow members Gary Driscoll and Craig Gruber, and started the band Bible Black.

After this, MacDonald and Driscoll worked with Anthrax producer Carl Canedy to put together the album Thrasher, with various other musicians.

In 1988 he was contacted by Blue Cheer bassist Dickie Peterson, and he joined them for the 1989 live album Blitzkrieg over Nüremberg and 1990's Highlights and Lowlives, followed by a tour of the United States.

In 1992 he left Blue Cheer, being replaced with Dieter Saller, following which he built a recording studio and started the band Playground.