Konstantinos Gelaouzos is a Greek long-distance runner. He was born on 21 November 1990 in Amfissa and resides in Athens. His personal best in the Marathon run (2:14:15) places him in the fifth place among all time Greek Marathon runners.

The men's half marathon at the 2016 European Athletics Championships took place on the streets of Amsterdam on 10 July. The start and finish of the race were on the Museumplein. Due to 2016 being an Olympic year the marathon is replaced by a half marathon. This is the first time that the half marathon has been run during the European Championships.