Peter Nielsen may refer to:
Sports Peter Nielsen (footballer) (born 1968), Danish footballer Peter Nielsen (sport shooter) (1890–1972), Danish Olympic shooter; see Shooting at the 1912 Summer Olympics – Men's 50 metre pistol Peter Heine Nielsen (born 1973), Danish chess grandmaster Peter Meinert Nielsen (born 1966), Danish road bicycle racer
Others Peter Nielsen (actor) (1876–1949), Danish film actor Peter Nielsen (botanist) (1829–1897), Danish botanist, mycologist and plant pathologist Peter E. Nielsen, Danish biochemist and inventor of Peptide nucleic acid Peter Alsing Nielsen (1907–1985), Danish painter Peter Nielsen (air traffic controller) (died 2004), Danish-born Swiss air traffic controller at the time of the 2002 Überlingen mid-air collision Peter Nielsen, contestant on series four of the Irish TV series The Apprentice
See also Peter Neilson (disambiguation) Pete Nielsen (1938–2019), American politician