The 38-year-old midfielder has called time on a glittering career after helping Paris St Germain to the French championship, which made him the first Englishman to win titles in four different countries.
The ex-England captain said: "I'm thankful to PSG for giving me the opportunity to continue but I feel now is the right time to finish my career, playing at the highest level.
"If you had told me as a young boy I would have played for and won trophies with my boyhood club Manchester United, proudly captained and played for my country over one hundred times and lined up for some of the biggest clubs in the world, I would have told you it was a fantasy. I'm fortunate to have realised those dreams."
Becks, part of United's famed FA Youth Cup-winning side of 1992, made his senior Reds debut in a League Cup tie at Brighton in September that year.
He had to wait until 1995 for his league bow but went on to win six Premier League titles, two FA Cups and the Champions League in 1999.
The right winger netted 85 times in 394 appearances for Sir Alex's men during that trophy-laden period, in which he became a global icon. A master of the dead ball, he'll always be remembered for his incredible goal from the halfway line against Wimbledon in 1996.
He left Old Trafford for Real Madrid in the summer of 2003 and spent four seasons in Spain, winning La Liga in the last of those, before signing for LA Galaxy, where he won two MLS Cups.