May Routh was an American costume designer.

Routh did several projects with director John Frankenheimer, starting with the acclaimed 1996 Civil War-set Andersonville and followed by another TNT miniseries, 1997's George Wallace, starring Gary Sinise as the Alabama governor, and the big-screen action thrillers Ronin (1998) and Reindeer Games (2000).

Routh received Emmy nominations for her work on Andersonville and the 1991 CBS telefilm Lucy & Desi: Before the Laughter, starring Frances Fisher and Maurice Benard.

She earned her first screen credit as a costume designer on Nicolas Roeg's The Man Who Fell to Earth (1976), starring David Bowie.

Routh died June 1, 2022 in Los Angeles, California. She was 87.