Mark D. Smith (born January 5, 1952) is an American politician who has served as a member of the Iowa House of Representatives since 2001.

He earned a Bachelor of Science from Graceland College and a Master of Social Work from the University of Iowa.

Smith serves on the Commission on Tobacco User Prevention and Control and on the Iowa Comprehensive Health Insurance Board.

On September 22, 2019, Smith announced that he would not seek re-election in 2020 and will retire after 20 years of service.

[1] On February 15, 2020, Smith was elected chair of the Iowa Democratic Party.