The 2018 FINA Marathon Swim World Series, also known as the FINA/HOSA Marathon Swim World Series for sponsorship reasons, took place from 17 March to 9 November 2018. It was the 12th edition of the FINA-sanctioned series, and included eight events.
The calendar for the 2018 series, announced by FINA.
The top ten finishers in each event.