27 November 2024 10:35 pm Views - 20
Marler joined the London club in 2009, making 285 appearances. He won the Premiership trophy twice as well as the European Challenge Cup.
"The time has come to finally jump off the rollercoaster and walk away from this beautifully brutal game," said Marler.
"On Friday night I'll play my last ever match for Quins. After all these happy years, it's over.
"The most important thing I want to say to our fantastic supporters is 'Thank you'. Thank you for your patience and support, when you could easily have turned your back on me.
"For the kindness you've shown, even when I haven't deserved it, and for cheering my name, even after I'd been banned again."
Head coach Danny Wilson said: "Joe should be incredibly proud of his fantastic career.
"He's a remarkable character on and off the pitch and hugely popular with our supporters. In retirement he should rightly be recognised for his outstanding achievements for both club and country."