Gyula Kellner
Gyula Richárd Kellner was a Hungarian athlete. He competed at the 1896 Summer Olympics in Athens.
Kellner was one of 17 athletes to start the marathon race. He finished in fourth place, but when the third-place finisher, Spiridon Belokas, was found to have covered a portion of the race by carriage, Kellner was awarded third place. His time was 3:06.35.