Vojáček (feminine: Vojáčková) is a Czech surname. It is a diminutive of the word voják (soldier). Notable people with the name include:
Jan Vojáček (born 1981), Czech footballer Jiří Vojáček (born 1966), Czech politician Kateřina Vojáčková (born 1997), Czech snowboarder Rostislav Vojáček (born 1949), Czech footballer
See also Wojaczek, Polish version of the surname