Robert Lewis Sims (born October 10, 1965 in Chicago, Illinois) a lyric baritone who specializes in African-American folk songs and spirituals, is known for his rich tone, energetic performances and convincing stage presence.

Robert Sims, the Gold Medal winner of the American Traditions Competition, gave the first all spiritual and folk song recital at Carnegie Hall’s Zankel Hall in 2005. In March 2009, he was invited by Jessye Norman to participate in Honor! A Celebration of the African American Cultural Legacy at Carnegie Hall. Sims has performed in recital with folk legend Odetta and renowned opera and concert singers George Shirley, William Warfield, Simon Estes, Benjamin Matthews, and Jubilant Sykes. Equally at home with standard operatic literature and classic jazz, Robert has collaborated with the Georgia Guitar Quartet in songs from Bernstein to Bob Dylan. He joined David Baker and Mercedes Ellington for Duke Ellington’s The Sacred Concerts and My People, and in 1997 toured Japan with the Pacific Music Festival Orchestra singing Leonard Bernstein’s Opening Prayer. A favorite at Dr. Robert Schuller’s Crystal Cathedral in Garden Grove, California, Sims has appeared on several Hour of Power international telecasts. In January 2011, Sims performed with the Mormon Tabernacle Choir on a special broadcast of the choir's long-running Music and the Spoken Word.