Antoine Robert Onslow "Tonny" van Lierop (19 September 1910 in Vught[1] – 31 March 1982 in Blaricum) was a Dutch field hockey player who competed in the 1936 Summer Olympics.

He was a member of the Dutch field hockey team, which won the bronze medal.

In 1928 he was a squad member of the Dutch field hockey team, but he did not compete.

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