Viktor Trkal (14 August 1888, Ostřetín – 3 September 1956, Prague) was a Czech physicist and mathematician who specialized in theoretical quantum physics.

His mathematics professors were Karel Petr (1868–1950), Jan Sobotka (1862–1931) and then beginning Bohumil Bydžovský (1880–1969).

Thanks to his advocacy, Trkal was assigned to the new University of Perm in the Urals, where he obtained his habilitation qualification and became associate professor of mechanics and physics in 1918.

After the war he returned to Czechoslovakia where he taught in high school and became a physics assistant to Professor Záviška.

The urn with Trkal's ashes was placed in the tomb of the Baštecký family, from which his wife Marie, a high school professor (1896–1965), came.