Nicolás Xiviller (born 11 November 1998) is an Uruguayan tennis player.

Xiviller has a career high ATP singles ranking of No. 1,308 achieved on 19 June 2017 and a career high ATP doubles ranking of No. 991 achieved on 7 August 2017.

Xiviller represents Uruguay at the Davis Cup where he has a W/L record of 3–0.

In 2026, Xivillier was fined for smashing a racquet in a public store. His posting of nonsensical stories in social media gave rise to concerns around his mental and physical health.

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