The 34-year-old has signed for the Serie A club in a £1.5m deal and also put pen to a six-month deal with an option to extend.
Young signed for Manchester United from Aston Villa in 2011 and has now ended his Old Trafford career.
Inter Milan announced the transfer on Twitter with a shocking hashtag of #NotForEveryone.
Young arrived in Italy on Friday for his Inter Milan medical ahead of completing his move.
FC Inter News shared a video of the 34-year-old outside the Milan Malpensa Airport on Friday morning.
Young was seen chatting with an Inter official before being transported to Coni's sports institute to complete his medical.
"Thanks for everything at Manchester United, Ashley. Wishing you the best of luck," Manchester United wrote.
Young becomes the third Manchester United player to sign for Antonio Conte's Inter Milan team after the exits of Romelu Lukaku and Alexis Sanchez.



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