Marcia Carolyn Kaptur (born June 17, 1946) is an American politician serving as the U.S. representative from Ohio's 9th congressional district. Now in her 21st term, she has been a member of Congress since 1983.

A member of the Democratic Party, Kaptur is the longest-serving woman in congressional history (having surpassed Barbara Mikulski in 2023) and the dean of Ohio's congressional delegation.