White joins Orient on a season-long loan.
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The 22 year-old told Orient's website, "Once Newcastle told me that I'd be allowed to go out on loan, Leyton Orient was my first choice.
"I saw a lot of the team towards the end of last season, and it was a really exciting one to watch.
"I've got better with every loan spell I've had and I believe that my skills can really contribute to us having an entertaining team again this season."
Orient head coach Richie Wellens said: "We know we had to make a lot of signings this window due to our departures, and Joe was someone we identified early on as being someone we wanted to bring in."