Mensing is a German surname. Notable people with the surname include:
Barbara Mensing (born 1960), German archer
Johannes Mensing (1477–1547), German Dominican theologian
Jenny Mensing (born 1986), German swimmer
Simon Mensing (born 1982), footballer
Gladys Mensing, who was a party to the PLIVA, Inc. v. Mensing case decided by the Supreme Court of the United States in 2011