Hampshire held their nerve despite a brutal late assault by Yorkshire's David Miller to claim their second Friends Life t20 title in three years at Cardiff's SWALEC Stadium.
The Royals followed up their 2010 success with a 10-run victory over a Tykes side who made a thrilling dash for the line courtesy of Miller's six-laden 72 not out.
The South African cleared the ropes five times and added five fours in his 46-ball knock but it was the more measured approach of Hampshire that ultimately won the day.
Jimmy Adams' 43 was the best they managed in a first-innings total of 150 for six but they triumphed due to the cool heads of opening bowlers Dimitri Mascarenhas and Liam Dawson as well as Chris Wood.
With 14 needed and Miller rampant, Wood conceded just three from the last over and finished up with wickets from the last two balls of the match.