Messmer is a surname of German origin, a spelling variation of Messner (sacristan/sexton) in the Alemannic and Swabian dialects. Notable people with the surname include:
- Anna-Katharina Messmer, German activist and sociologist
- Arwed Messmer, German photographer and artist
- Henry Messmer (1839–1899), Swiss-American architect
- Ivan Messmer (1931–2015), Canadian politician
- John Messmer (1884–1971), American athlete
- Léon Messmer (1900–1987), French Roman Catholic bishop in Madagascar
- Magali Messmer, Swiss triathlete
- Mark Messmer, American politician
- Mindi Messmer, American politician
- Nikolaus Messmer (1954–2016), Russian Roman Catholic bishop, Apostolic administrator or Kyrgyzstan
- Otto Messmer (1892–1983), American animator
- Otto Messmer (Jesuit) (1961–2008), Russian Jesuit priest, head of Jesuits in the CIS
- Pearl Ray Messmer (1892–?), Australian orchidologist
- Pierre Messmer (1916–2007), French Prime Minister
- Sebastian Gebhard Messmer (1847–1930), Swiss-born Roman Catholic archbishop of Milwaukee
- Thomas Messmer, German tennis player
- Wayne Messmer, announcer for the Chicago Cubs
- Messmer (hypnotist), stage name of Éric Normandin, French Canadian hypnotist
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