Robert Haimer (born March 2, 1954) is an American musician, singer and songwriter. He performed in the two-man band Barnes & Barnes as his stage persona Artie Barnes, alongside actor and musician Bill Mumy. Haimer became friends with Mumy in 1965 at his school's Halloween carnival day.

Recently, Haimer has sold self-made CD-R's of his private demo recordings on eBay. He has also uploaded videos to YouTube, in character as Artie Barnes.

Haimer also collaborated with the band America. He is featured on View from the Ground (1982), Your Move (1983), Perspective (1984), Encore: More Greatest Hits (1991) and Hourglass (1994).