István Timár-Geng (7 January 1940 – 4 December 1994) was a Hungarian sprint canoer who competed from the mid-1960s to the early 1970s. At the 1968 Summer Olympics in Mexico City, he won two medals with a silver in the K-2 1000 m and a bronze in the K-4 1000 m events.

Timár-Geng also won four medals at the ICF Canoe Sprint World Championships with two gold (K-2 10000 m and K-4 10000 m: both 1963), a silver (K-4 10000 m: 1971), and a bronze (K-4 1000 m: 1970).

• ICF medalists for Olympic and World Championships – Part 1: flatwater (now sprint): 1936–2007 at the Wayback Machine (archived 2010-01-05)
• ICF medalists for Olympic and World Championships – Part 2: rest of flatwater (now sprint) and remaining canoeing disciplines: 1936–2007 at WebCite (archived 2009-11-09)

• István Timár at Olympics at Sports-Reference.com (archived)
• Istvan Timar at Olympics.com