A sideman is a musician who performs live with a band of which they are not a permanent member.
The Sidemen is a British YouTube group.
Sideman or Sidemen may also refer to: Sidemen, Bali, a district in the Karangasem Regency of Bali Sideman (bishop), a 10th-century Bishop of Crediton, modern Exeter Side Man, a play by Warren Leight, finalist for the 1999 Pulitzer Prize for Drama
See also Sidesman, a term related to churches