Connelly is an anglicised form of the Gaelic-Irish surname Ó Conghalaigh. Following is a list of notable people with the surname Connelly:

• A. Scott Connelly, owner of Met-Rx, Inc.
• Al Connelly, guitarist with band Glass Tiger
• Ana Paula Connelly, Brazilian beach volleyball player
• Bert Connelly, Canadian ice hockey player
• Bill Connelly (baseball), American baseball player
• Bill Connelly (soccer), American soccer player
• Bob Connelly, Scottish footballer
• Brent Connelly, Australian Rules footballer
• Charlie Connelly, British author
• Chris Connelly (journalist), American sports and entertainment writer
• Chris Connelly (musician), Scottish singer/songwriter
• Christopher Connelly (actor), American actor
• Chuck Connelly, American painter
• Cornelia Connelly, founder of the first Holy Child School
• Dale Connelly, American radio host
• Edward Connelly, American silent film actor
• Fred Connelly, English footballer
• George Connelly, Scottish footballer
• Henry Connelly, Governor of New Mexico (1861–1866)
• Henry C. Connelly (1832–1912), New York politician
• James Connelly (ice hockey), Canadian ice hockey player
• Jennifer Connelly, American actress
• Jeter Connelly Pritchard, American politician
• Joan Breton Connelly, American classical archaeologist
• Joe Connelly (musician), American singer and musician
• Joe Connelly (writer), American writer
• John Connelly (disambiguation)
• Karen Connelly, Canadian writer
• Kevin Connelly, British comedian and impressionist
• Lloyd Connelly, American Superior Court judge
• Marc Connelly, American playwright
• Mark Connelly (historian), British historian
• Maryanne Connelly, American Democratic politician
• Matthew Connelly, American educator
• Matthew J. Connelly (1907–1976), American businessman and civil servant
• Michael Connelly, American detective writer
• Michael Connelly, American Republican politician
• Michael Connelly (New Zealand politician), New Zealand Labour Party activist, father of:
• Mick Connelly (Michael Aynsley Connelly), New Zealand Labour Party politician and cabinet minister.
• Mike Connelly, American footballer
• Peggy Connelly, American singer and actress
• Peter Connelly, Video game composer
• Reg Connelly, British songwriter and music publisher
• Robert Connelly, American mathematician
• Ross J. Connelly, COO of OPIC
• Ryan Connelly (born 1995), American football player
• Sean Connelly, English footballer
• Sean Connelly (judge), American judge
• Ted Connelly (1918–2013), Australian politician
• Tina Connelly, Canadian track and field athlete
• Thomas M. Connelly, Executive Vice President of E. I. Du Pont de Nermours and Company
• Tom Connelly, American baseball player
• Wayne Connelly, former Canadian ice hockey player
• William A. Connelly, American Sergeant Major of the Army