István Avar (German: Stefan Auer, Romanian: Ștefan Auer) (28 May 1905 – 13 October 1977) was a footballer and manager of German descent who at various times competed for both Hungary and Romania as a forward.

He was born in Arad, Hungary, which became part of Romania in 1920.

With Újpest, Avar won the Mitropa Cup in 1929, being the competition's top scorer with ten goals,[2] and the Coupe des Nations in 1930.

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