Widmer is a surname. Notable individuals with this surname include:
Albert Widmer, inventor of 8b/10b encoding Arthur Widmer (1914–2006), American film special effects pioneer Carolyn Ladd Widmer (1902–1991), academic dean at the University of Connecticut Daniel Widmer, Swiss curler Edward L. Widmer (born 1963), historian, speechwriter, and librarian Eric Widmer (1940–2025), American scholar and educator Gabrielle Oberhänsli-Widmer (born 1957), Professor of Jewish studies at the University of Freiburg Gianni Widmer (1892–1971), flight pioneer Jacob Zachery Widmer, American-Filipino newspaper editor and writer for the Daily Bugle. Jean Widmer (1929–2026), Swiss-French graphic designer Kurt Widmer (1940–2023), Swiss baritone
Marise Widmer, American rower Markus Widmer, Swiss curler Pierre Widmer (1912–1999), French Mennonite pastor Samuel Widmer (1948–2017) Swiss physician, psychiatrist, psychotherapist and author Sigmund Widmer (1919–2003), Swiss politician Silvan Widmer (born 1993), Swiss footballer
See also Widmer Brothers Brewery, an American brewery founded in 1984 in Portland, Oregon by brothers Kurt and Rob Widmer Wiedmer