Ivar-Lykke Seidelin-Nielsen (7 March 1889 in Frederiksberg, Copenhagen – 9 January 1955 in Frederiksberg, Copenhagen), known as Ivar Lykke for short, was a Danish amateur football (soccer) player, who played as a defender.

[1] He played his entire career for Copenhagen club KB, with whom he won several Danish football championships.

He played his last national team game at the 1920 Summer Olympics, where Denmark was eliminated in the first round by Spain.

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