Kreyer is a surname. It can refer to the following people:
Frank Kreyer (b.1970), US racecar driver Georgij Karlovich Kreyer (1887-1942), Russian botanist and mycologist (1890–1949), British brigadier (b.1956), German politician (b.1952), German former Formula One engineer Robin Kreyer (1910-1987), English cricketer and soldier (b.1973), German linguist Scott Kreyer, original member of Canadian rock band Toronto Sven Kreyer (b.1991), German footballer Vitold Kreyer (b.1932), Russian retired triple jumper