Timothy or Tim Johnson may refer to:

• Tim Johnson (artist), contemporary Australian artist, winner of the Arthur Guy Memorial Painting Prize in 2011
• Tim Johnson (film director) (born 1961), American film director
• Timothy Johnson (medical journalist) (born 1936), American television personality and author
• Tim Johnson (songwriter) (1960–2012), songwriter and producer

• Tim Johnson (baseball) (born 1949), American shortstop and manager
• Tim Johnson (curler) (born 1953), American curler
• Tim Johnson (cyclist) (born 1977), American professional cyclocross racer
• Tim Johnson (defensive lineman) (born 1965), American football defensive lineman
• Tim Johnson (American football coach) (born 1962), American college coach of Kansas City's Avila University Eagles
• Tim Johnson (linebacker) (born 1978), American football linebacker
• Tim Johnson (wheelchair rugby) (born 1976), New Zealand wheelchair rugby player
• Timothy Johnson (fighter) (born 1985), American mixed martial artist
• Timothy Johnson (sprinter), winner of the 1965 4 × 440 yard relay at the NCAA Division I Indoor Track and Field Championships

• Tim Johnson (Illinois politician) (1946–2022), U.S. Representative from Illinois, 2001–2013
• Tim Johnson (South Dakota politician) (1946–2024), U.S. Senator from South Dakota, 1997–2015
• Timothy H. Johnson, American politician, member of the Kansas House of Representatives
• Timothy L. Johnson (born 1959), American politician, member of the Mississippi State Senate

• Timothy C. Johnson (died 2023), American economist
• Timothy P. Johnson (sociologist)
• Timothy Johnson, pioneer and founder of Watertown, Wisconsin
• Timothy Johnson, fatally shot Arkansas State Democratic Party Chairman Bill Gwatney, August 13, 2008
• Tim Johnson, a character in Harper Lee's To Kill a Mockingbird

• Tim Johnston (disambiguation)