Tabby Thomas (born Ernest Joseph Thomas, Baton Rouge, Louisiana, United States, January 5, 1929 - January 1, 2014) also known as Rockin' Tabby Thomas, was an American blues musician. He sang and played the piano and guitar, and specialized in a substyle of blues indigenous to southern Louisiana called swamp blues.

Thomas was one of the best known blues musicians in Baton Rouge, and had, since the late 1970s, operated his own blues club there, Tabby's Blues Box and Heritage Hall, until its closure in November 2004. Among his seven children is the noted blues musician Chris Thomas King. Thomas had a stroke in 2004, which affected his playing but not his singing. Recently, on Saturday afternoons he hosted the radio showed Tabby's Blues Box on Baton Rouge stations WBRH-FM and KBRH-AM, which originated from the media center of Baton Rouge Magnet High School. He was a member of The Hoodoo kings.