A stammer or stutter is a speech disorder typified by the involuntary repetition of a sound or sounds.

Stammer may also refer to: "Stammer", a song by the Supernaturals from It Doesn't Matter Anymore

People with the surname Kay Stammers (1914–2005), British tennis player Keith Stammers, 20th-century English politician Reinhard Stammer (born 1952), German painter & artist Richard Stammers, special effects artist Stan Stammers (born 1961), British punk musician

See also List of people known as the Stammerer Stamer Stahmer