The highly rated young winger arrives this season from Bedford Blues.
An England U20s graduate, Bassett topped the RFU Championship try-scoring charts during the 2011/12 season with 14, and was in excellent form again last season scoring a multitude of tries.
He also represented the RFU Championship XV against the New Zealand Maori in Doncaster in November and Bassett descibes facing the New Zealand Maori Haka as one of his favourite experiences so far.
Bassett will link up with Tommy Bell, Nathan Morris and Alec Hepburn at London Wasps who were all teammates when he represented England at the Junior World Championships in South Africa last summer.
Bassett began playing rugby at Ampthill RUFC and is currently studying for a Sports and Exercise Science degree at the University of Bedfordshire.
Follow Josh on Twitter @JoshBassett