The 22-year-old has scored four tries for the Exiles this season including a dramatic last gasp intercept winner to beat Bath at the Kassam Stadium in October in the Aviva Premiership.
Scott huge impact the winger has made at London Welsh since joining on loan in February 2012 from Bath, where he came through the academy.
He played a leading role in the club's Championship success, scoring seven tries in ten appearances during the play-offs.
"I have been at the club just under a year and have thoroughly enjoyed my time here," Scott said.
"I feel my game has improved working with Lyn Jones and the other coaching staff and I'm confident it will continue to do so under their guidance.
"I'm looking forward to the challenge of consolidating London Welsh's Premiership status with a great bunch of teammates."
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