Robert William Lamm (born October 13, 1944) is an American musician and a founding member of the rock band Chicago.

He is best known for his songwriting, vocals, and keyboard melodies, most significantly on the band's debut studio album, Chicago Transit Authority (1969).

Lamm is one of three founding members (alongside Lee Loughnane and James Pankow) still performing with the group.

[1] He studied art in high school, particularly drawing and painting, but changed direction in college by enrolling in the music program at Roosevelt University in Chicago.

Lamm seemingly drifted into a period of both personal and professional frustration including a bout with drug addiction.

He formed a trio (Beckley-Lamm-Wilson) with Gerry Beckley of the band America and Carl Wilson of The Beach Boys.

In Chicago's early years, Lamm used a simple setup of Hammond organ and Wurlitzer Electric Piano.

According to an interview with Keyboard Magazine in 1979, he discovered that he no longer needed the Hammond organ after starting to play the CS80, so he retired it.