However, as Kate would be married to a King rather than reigning in her own right, she won't become Queen in the same way that Her Majesty Queen Elizabeth II is. Once Prince William takes the throne and becomes the King of England, Kate will then become Queen Consort.

Will Kate become Queen when William becomes king?

But when William takes to the throne and becomes King she will not officially become Queen. Instead she will be Queen Consort, The title indicates that she has no official power or constitutional role. ... But while Kate is Queen Consort, she will commonly be known as Queen Catherine.

Will Kate be called Queen Catherine?

As Town&Country explained, Kate will be known all over the world as Queen Catherine. However, Marlene Koenig, royal expert and author of the blog Royal Musings, her official title will be Queen consort. That is because she wasn't born into the family but rather, she married into it.