Ruddy has been named as one of three goalkeepers - along with Manchester City's Joe Hart and West Ham's Robert Green - in Roy Hodgson's 23-man squad for the tournament in Poland and Ukraine.
The 25-year-old will link up with the England squad for their first preparation match away against Norway on May 26.
But the Football Association have given Ruddy special dispensation to miss the Belgium game at Wembley on June 2 so he can marry his partner, Laura.
"I'm absolutely delighted and so grateful to the Football Association for agreeing to let me go ahead and get married," Ruddy told the Norwich City website.
"It would have been a nightmare after one and a half years of planning to have to postpone the wedding so it's a major relief that we can still go ahead."
Hodgson said he was more than happy for Ruddy to go ahead with his plans to marry ahead of the tournament.
"When he was told (of his call-up) he offered to postpone the wedding but I said not to do that," Hodgson said at a Wembley press conference.
"I think it's a bit dangerous to cancel weddings at the last moment. This is a football match, it's not the end of the world.
"I suggested we deal with the Belgium game with Joe Hart and Rob Green and we'll welcome him back on the plane when we go to Poland."
Ruddy's situation is the polar opposite to that Portugal full-back Miguel Lopes, a surprise pick for Euro 2012.
Lopes said it was the happiest day of his life when coach Paulo Bento called him up even though it forced him to scrap his wedding plans.
"I had to talk to a lot of people, but they understood why I had to cancel the wedding and gave me a lot of support, another day will come," Lopes, 25, said.
He did not specify if his wife-to-be was one of the people who understood his decision, but admitted the first thing he did after hearing about the call-up was to kiss his fiancée Monica Pina.
"This is the happiest day of my life," the Braga player said.
Lopes's wedding had been scheduled for the same day as Portugal's pre-tournament friendly against Macedonia on May 26.