Mark Avsec (born August 23, 1954) is an American rock keyboardist, songwriter, and producer. He was a member of the funk rock band Wild Cherry.
Avsec was an original member of Donnie Iris & the Cruisers. He wrote or co-wrote all of the band's music, was its sole lyricist, and produced all of its albums.
Since 1995, he has also been a copyright lawyer.