Dennis Johnson (1954–2007) was an American basketball player.

Dennis or Denis Johnson may also refer to:

• Denis Johnson (inventor) (c. 1760 – 1833), British coachmaker and bicycle-maker
• Dennis Johnson (North Dakota politician) (born 1949), American politician
• Dennis Johnson (Oklahoma politician) (born 1953), American politician
• Denis Johnson (1949–2017), American author
• Dennis Johnson (defensive tackle) (1951–1997), American football defensive lineman for the Washington Redskins and Buffalo Bills
• Dennis Johnson (linebacker) (born 1958), former American football linebacker for the Minnesota Vikings and the Tampa Bay Buccaneers
• Dennis Johnson (fullback) (born 1956), former American football fullback for the Buffalo Bills and New York Giants
• Dennis Johnson (defensive end) (born 1979), former American football defensive end for the Arizona Cardinals and San Francisco 49ers
• Dennis Johnson (running back) (born 1990), American football running back
• Dennis Johnson (athlete) (1939–2021), Jamaican sprinter
• Dennis Johnson (composer) (1938–2018), American mathematician and composer
• Dennis Johnson (coach) (born 1988), American football coach

• Dennis Johnsen (born 1998), Norwegian professional footballer
• Denis Johnston (1901–1984), Irish writer
• Dennis Jonsson (born 1983), Swedish football defender
• Dennis Jonsson (speedway rider) (born 1991), Swedish speedway rider