The professional boxer who holds several titles was seen attending the protest while on crutches.
Daily Sun reported he sustained injury in a recent training session.
Wearing a boyish smile, Anthony Joshua adorned a black hoodie engraved with the words “Black Lives Matter”.
Joshua also wore on a leg brace.
See photos of Anthony Joshua at the protest below;
Watch Anthony Joshua as he makes his voice heard during the #BlackLivesMatter protest in Watford below;
Anthony Joshua makes his voice heard at today's Black Lives Matter protests in Watford. pic.twitter.com/48cJgFxG4x
— Boxing on BT Sport 🥊 (@BTSportBoxing) June 6, 2020