Sieminski (born October 20, 1932) is a former Republican member of the Pennsylvania House of Representatives.
He served in the House after being elected to serve a district that included the City of Easton in Northampton County, Pennsylvania.
Sieminski entered politics after a distinguished career as an officer in the United States Army, retiring with a rank of lieutenant colonel.
He is a decorated combat veteran, having served two tours in the Vietnam War.
Sieminski graduated with a Bachelor of Science degree from the University of Scranton in 1955 and Master of Science degree from Duquesne University in 1974.