Leo Dannin (26 March 1898 – 15 September 1971) was a Danish footballer who played for Kjøbenhavns Boldklub. He represented Denmark in the men's tournament at the 1920 Summer Olympics. Denmark were eliminated in the preliminary round.
International career
Dannin made his debut for Denmark on 5 April 1920 in a 2–0 defeat to Netherlands. Later that year, he was part of his country's squad at the 1920 Olympic Football Tournament. Denmark were eliminated in the first round against Spain, and finished as the ninth-best team of the 13 participants. Dannin played a total of nine times for Denmark, with his final match being played in April 1922 against Netherlands.