The 2021 Island X-Prix (formally the 2021 Enel X Island X-Prix) was an Extreme E off-road race that was held on 23 and 24 October 2021 at Capo Teulada, in the Sulcis-Iglesiente region of the Italian island of Sardinia.

It was the fourth round of the electric off-road racing car series' inaugural season.

The final was won by championship leaders Molly Taylor and Johan Kristoffersson for the Rosberg X Racing team, ahead of Abt Cupra XE and JBXE.

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