Olney claimed bragging rights over neighbours Wellingborough with a brilliant first half display to win 20-0.
Wellingborough started the day top of the league, but the two sides balanced each other out in the opening exchanges.
But Olney put the first points on the board after 25 minutes, when Jack Sutton, coming off the back of a scrum and fed through Ollie Simons to Will Edwards on the wing who ran a try in the corner to make it 5-0.
Wellingborough missed a penalty attempt before Olney extended their lead five minutes later, when Jonny Munday chipped the ball into the visitors’ in goal area and was able to follow up and touch down for a try that he also converted, extending the lead to 12-0.
Olney would cross the line again before half time, when a misplaced Wellingborough penalty allowed Jon Brice to break down the right, touching down to make it 17-0.
A Munday penalty extended the lead further to 20-0 at the interval.
A renewed Wellingborough side were on top for long spells in the second period, but some brilliant defending from Olney kept them at bay right to the final whistle.
The result meant Olney got their hands on the Lewis Wilkinson Trophy - the trophy the sides annually play for.