A peak audience of 6.6 million watched as Eddie 'The Eagle' Edwards triumphed ahead of Benidorm actor Jake Canuso and Changing Rooms Linda Barker, in the last show of the series.
The Olympic medallist said he was"over the moon" about the news: "It's a dream come true for me to be involved in an entertainment show which has been so successful and also fits so well around my training schedule.
"Splash! has put diving on primetime TV and diving clubs all across the country have kept telling me that they now have waiting lists, following the popularity of the show. That in itself is an incredible achievement and I'm very excited to be part of it."
ITV's director of entertainment and comedy Elaine Bedell said: "We're looking forward to even more Saturday night spectacle, and sparkle, with the second series."