The agreement is for three years and will include FxPro figuring on Fulham's team shirt.
Cottagers chief Alistair Mackintosh said: "I am delighted to welcome FxPro to Fulham during a period of such success and optimism on and off the pitch. It is always a cause for celebration when you have an opportunity to work with a brand that shares your commitment and vision for success.
"FxPro already has global presence and, partnering another Premier League football club, will enhance this even further. Clearly this has additional benefits for Fulham's global reach which, following the European success of last season and the recognition the Club received worldwide, is something that we are extremely excited about."