Hans Nielsen may refer to:

• Hans Nielsen (actor) (1911–1965), German actor
• Hans Nielsen (American football) (born 1952), Danish football player
• Hans Nielsen (composer) (1580–1626), Danish madrigal composer at the court of Christian IV
• Hans Nielsen (speedway rider) (born 1959), Danish speedway racer
• Hans Bruun Nielsen, Danish mathematician
• Hans Christian Nielsen (1928–1990), Danish footballer
• Hans Christian Nielsen (cyclist) (1916–2004), Danish cyclist
• Hans Frede Nielsen (1943–2021), Danish philologist
• Hans Jacob Nielsen (1899–1967), Danish boxer
• Hans Peter Nielsen (gymnast) (born 1943), Danish gymnast
• Hans Peter Nielsen (politician) (1852–1928), Danish farmer and politician