Ingar Nielsen (29 August 1885 – 21 January 1963) was a Norwegian sailor who competed in the 1920 Summer Olympics and in the 1924 Summer Olympics.

In 1920 he was a crew member of the Norwegian boat Eleda, which won the gold medal in the 10 metre class (1907 rating).

Four years later he won his second gold medal in the 8 metre class.

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