And tributes have poured in from around the footballing world for one of the most recognisable and influential players this century.
And now Puma - current Arsenal shirt sponsors - have gathered a series of top players to thank Henry for his contribution to the game.
Arsenal quartet Olivier Giroud, Santi Cazorla, Tomas Rosicky and Mathieu Flamini lead the tributes while Liverpool's Mario Balotelli and Adam Lallana, Bayern Munich's Dante, Chelsea's Cesc Fabregas and Nemanja Matic, PSG's Marco Verratti, Atletico Madrid's Antoine Griezmann, Dortmund's Reus, Juventus' Giorgio Chiellini all paid homage to Henry in their native tongue as part of the #merciThierry campaign.
Henry announced his retirement on Facebook, saying: "After 20 years in the game I have decided to retire from professional football.
After 20 years in the game I have decided to retire from professional football.
"It is now time for a different career path and I am pleased to say that I will be returning to London and joining Sky Sports. I will hopefully share some of the insights, observations and experiences I have learnt over the years with you guys.
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