Arne Blach (8 July 1900 – 11 July 1977) was a Danish field hockey player who competed in the 1928 Summer Olympics and in the 1936 Summer Olympics.
He was born in Copenhagen and died in Helsingør.
In 1928 he was a member of the Danish team which was eliminated in the first round of the Olympic tournament after two wins and two losses.
Eight years later he was eliminated with the Danish team in the first round of the 1936 Olympic tournament.
This biographical article relating to a Danish field hockey figure is a stub.