| Birth Name: | Ilja Laman |
| Birth Date: | 1944 2, df=y |
| Birth Place: | IJmuiden, the Netherlands |
| Height: | 1.65m (05.41feet) |
| Weight: | 51kg (112lb) |
| Sport: | Sprint |
| Club: | De Spartaan, Lisse |
| Show-Medals: | yes |
Ilja Keizer (née Laman; born 26 February 1944) is a retired middle-distance runner from the Netherlands. She competed at the 1968 and 1972 Summer Olympics in the 800 m and 1500 m, respectively, and finished in sixth place in 1972.
In 1970 and 1972, Keizer-Laman was selected as the Dutch female athlete of the year. Her personal bests were 2:02.2 in the 800 m (1968) and 4:05.13 in the 1500 m (1972).