Marcia A. Strassman (born April 28, 1948) is an American actress best known for her roles as Julie Kotter in the TV sitcom Welcome Back, Kotter and Diane Szalinski in the 1989 feature film Honey, I Shrunk the Kids, its sequel Honey, I Blew Up the Kid and the 3-D film spin-off Honey, I Shrunk the Audience! which was shown at several Disney theme parks through mid-2010.

Strassman was born in New York City. Among her earliest acting credits was an appearance in an episode of The Patty Duke Show. In 1967, she became a recording artist for Uni Records. Her debut single, "The Flower Children", was a top 40 hit in many West Coast U.S. markets, most notably hitting #4 in San Diego and #2 in San Francisco; the track also hit #2 in Vancouver, Canada (both at CKLG 730 AM and CFUN 1410 AM in July 1967). However, the single failed to break out nationally in either country, stalling at #103 (U.S.). Strassman's followup release, "The Groovy World of Jack & Jill," charted in Denver but virtually nowhere else. A third single, 1968's "Star Gazer" (produced by Kim Fowley), failed to chart anywhere and brought Strassman's brief recording career to a close.