Johan "Jan" Blankers[a] (23 April 1904 – 17 July 1977) was a Dutch athlete and coach who competed at the 1928 Summer Olympics.

Blankers finished third behind fellow Dutchman Willem Peters in the triple jump event at the 1928 AAA Championships.

[1][2][3] Shortly afterwards he represented the Netherlands at the 1928 Olympic Games in Amsterdam, where he competed in the triple jump, but failed to reach the final.

[4] He won the national title in this event in 1931 and 1932, but later tore an Achilles tendon, which resulted in his retirement and in a slight limping for the rest of his life.

At the 1938 European Athletics Championships its members Fanny Blankers-Koen and Nelly van Balen-Blanken won three medals in the sprint and high jump.