Aro is a Finnish surname. Notable people with the surname include:
Carlos Aro (1939–2017), Argentine boxer Elizabeth Aro (born 1961), Argentine artist Johan Emil Aro (1874–1928), Finnish entomologist Jori Aro, Finnish curler Markku Aro (born 1950), Finnish singer Samuli Aro (born 1975), Finnish enduro rider Toivo Aro (1887–1962), Finnish diver Hasse Aro (born 1957), Swedish television host and producer