Scott had his first-place finish confirmed on Sunday, but had to wait until the conclusion of the event on Tuesday.
The 29-year-old did not even need to finish the medal race, but still crossed the line behind USA's Caleb Paine in second.
Rio 2016
Britain's Mills and Clark finally clinch 470 sailing gold
16/08/2016 AT 20:20
The Weymouth-based sailor won three of 11 races in the competition, and will now join up with Sir Ben Ainslie in his 2017 America's Cup team.
Scott hands GB their 17th gold of the Games, and the sailor follows in the footsteps of four-time Olympic gold medallist Ainslie.
Rio 2016
Netherlands' Bouwmeester wins Laser Radial gold
16/08/2016 AT 17:35
Rio 2016
Thompson must wait to fight for medal after Laser-class race postponed by a day
15/08/2016 AT 19:43