Hasan Hüseyin Kaçar (born 11 July 1988) is a Turkish middle and long distance runner competing in the T11 class.

[3] Kaçar competed at the 2013 IPC Athletics World Championships held in Lyon, France, and won the bronze medal in the 800m T11 event.

[3] Kaçar captured the silver medal in the 5000m T11 event at the 2014 IPC Athletics European Championships in Swansea, Wales, UK.

[5] He represented his country at the 2016 Paralympics in Rio de Janeiro, Brazil competing in the 1500m T11 and 5000m T11 events.

He finished fourth place in the 5000m T11 event at the 2016 Paralympics in Rio de Janeiro, Brazil.