Tomašić (pronounced [tɔ̌maʃitɕ]) is a Croatian surname. Notable people with the name include:

• Andy Tomasic (1917–2008), American football and baseball player
• Dinko Tomašić (1902–1975), Croatian sociologist
• Franjo Tomašić (1761–1831), Croatian nobleman and field marshal
• Igor Tomašić (born 1976), Croatian-Bulgarian footballer
• Luca Tomašić (born 1983), Italian footballer
• Ljudevit Tomašić (1901–1945), Croatian politician
• Marijan Tomašić (born 1986), Croatian footballer
• Nikola Tomašić (1864–1918), Croatian politician
• Ruža Tomašić (born 1958), Croatian politician