Robert Kraft has a new lady in his life ... someone he's been holding hands with at multiple major public events -- but her identity is a mystery!!!
People first noticed Kraft's new lady at the French Open in Paris back on June 9 -- when the New England Patriots owner showed up to watch some tennis from the VIP boxes with a female friend on his arm. You can see the two holding hands.
As for the new woman, we haven't been able to get a name -- and our sources won't tell us if they're "officially" boyfriend, girlfriend ... but he's now taken her to two major international events so it seems like they're more than friends at this point.