The fourth series of Love Island, a British dating reality show, began on 4 June 2018 on ITV2, and concluded on 30 July 2018. It is the fourth from the current revived series, but sixth overall. Caroline Flack presented the series, while Iain Stirling narrated it. The series opener received the highest rating on a digital TV programme since the 2012 Summer Olympics were broadcast on BBC Three; it was also the most watched programme ever on ITV2.

Love Island is a British dating game show. It is a revival of the earlier celebrity series of the same name, which aired for two series in 2005 and 2006. The series is the originator of the international Love Island franchise, with twenty-two versions of it having been produced so far worldwide. The show is presented by Maya Jama and narrated by Iain Stirling. The show was previously hosted by both Caroline Flack and Laura Whitmore.