Kreiner is a surname. Notable people with the surname include:
David Kreiner (born 1981), Austrian Nordic combined skier Josef Kreiner (born 1940), Austrian Japanology ethnologist Kathy Kreiner (born 1957), Canadian alpine skier Kim Kreiner (born 1977), American javelin thrower Laurie Kreiner (born 1954), Canadian alpine skier Marion Kreiner (born 1981), Austrian snowboarder Stefan Kreiner (born 1973), Austrian Nordic combined skier Tamás Kreiner, Hungarian composer
Fictional characters: Fitz Kreiner, character in the Doctor Who novel series Eighth Doctor Adventures