Neither Harry nor Meghan have met the bishop, but hope to do so before the service at St George's Chapel, Windsor, on Saturday.
"I'm thrilled that Prince Harry and Meghan Markle have asked Bishop Michael Curry to preach at their wedding", Welby wrote on Twitter. "And so we celebrate and pray for them today", Bishop Curry said in a statement.
Episcopal Church Presiding Bishop-elect Michael Curry gives waves to the crowd as he arrives at the Washington National Cathedral, Sunday, Nov. 1, 2015, in Washington.
The US-based Episcopal Church is a member of the global Anglican Communion, which includes the Church of England. Traditionally, addresses at royal weddings are given by senior clergy from the Church of England. "@PB_Curry is an excellent pastor, attractive preacher and somebody with a terrific present for sharing the excellent news of Jesus Christ".
Bishop Curry went to Hutch Tech, and although he no longer lives in Buffalo, the Queen city is near and dear to his heart. He was also one of the first bishops in the USA to allow same-sex marriages to take place in his church.
Episcopals worshiped on Monday knowing the head of the Episcopal Church in the U.S.is about to take the world stage at the Royal Wedding of Prince Harry and Meghan Markle. He's now based in NY.
They have recently announced who will be giving the address at the wedding.
The bishop previously made waves following the release of his book "Crazy Christians: A Call to Follow Jesus".
Harry and Markle's selection of an American pastor is a break from royal customized. The ceremony will be conducted by the Dean of Windsor, the Right Reverend David Conner, while Archbishop of Canterbury Justin Welby will oversee the marriage vows.
The world's eyes will turn to the United Kingdom on Saturday May 19, as the British Royal Family welcomes its newest member.