František Pechácek (February 15, 1896 – February 3, 1944) was a Czech gymnast who competed for Czechoslovakia in the 1920 Summer Olympics.
He was born in Záhornice near Mestec Králové and was murdered in Mauthausen-Gusen concentration camp.
In 1920 he was a member of the Czechoslovak gymnastic team which finished fourth in the team event.