Events from the year 1931 in Croatia.

Births April 4 – Nada Iveljić, children's writer (died 2009) May 11 – Zlatko Crnković, translator (died 2013) July 11 – Anđelko Klobučar, composer June 4 – Antun Vrdoljak, actor and film director June 14 – Vasko Lipovac, painter (died 2006) September 26 – Ivo Šlaus, physicist November 22 – Anton Tus, soldier December 11 – Sunčana Škrinjarić, children's writer (died 2004)

Deaths February 11 – Bela Čikoš Sesija, painter (born 1864) February 18 – Milan Šufflay, historian and politician (born 1879) December 29 – Oton Kučera, astronomer (born 1857)

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