| Jaap ten Kortenaar | |
| Fullname: | Jacob Christiaan "Jaap" ten Kortenaar |
| Birth Date: | 31 January 1964 |
| Birth Place: | Zoetermeer, Netherlands |
| Height: | 193cm (76inches) |
| Weight: | 800NaN0 |
| Discipline: | Road cycling |
Jacob Christiaan "Jaap" ten Kortenaar (born 31 January 1964) is a cyclist from the Netherlands. He competed in the men's team time trial at the 1992 Summer Olympics, finishing 9th.[1] He finished second and third at the Dutch National Time Trial Championships in respectively 1993 and 1994.
Jaap is the brother of speed skater Marnix ten Kortenaar.