As Surname
- Bert Keizer (born 1947), Dutch writer
- Cees Keizer (born 1986), Dutch footballer
- Garret Keizer, American author
- Gerrit Keizer (1910-1980), Dutch sportsman
- Jan Keizer (disambiguation), multiple people
- Jan Keizer (referee) (born 1940), Dutch sports referee
- Jan Keizer (singer) (born 1949), Dutch singer
- Jolanda Keizer (born 1985), Dutch heptathlete
- Joris Keizer (born 1979), Dutch swimmer
- Martijn Keizer (born 1988), Dutch racing cyclist
- Piet Keizer (born 1943), Dutch footballer
- Sanne Keizer (born 1985), Dutch volleyball player
- Simon Keizer (born 1984), Dutch singer
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