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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|- style="text-align:center" |width="35%"|Previous race:<br />2021 Arctic X-Prix |width="30%"|Extreme E Championship<br />2021 season |width="35%"|Next race:<br />2021 Jurassic X-Prix |- style="text-align:center" |width="35%"|Previous race:<br />N/A |width="30%"|Island X-Prix |width="35%"|Next race:<br />2022 Island X-Prix |- style="text-align:center"