Harold Avington Throckmorton (April 12, 1897 – November 5, 1973) was an American tennis player in the early 20th century.

He played intercollegiate tennis for Princeton University.

[6] In 1917 he won the men's doubles titles at the U.S. National Championships with Fred Alexander.

He left $2,500 (equivalent to $17,000 in 2023) for the care of his Irish terrier.

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