Do you know any good historical fiction novels about Catherine of Aragon?

You might be able to find the books Katherine, the Virgin Widow, In the Shadow of the Pomegranate, and The King's Secret Matter in a one-volume trilogy at your local bookstore. They're all by Jean Plaidy, a prolific author who wrote under at least three pseudonyms, including Victoria Holt and Philippa Carr (her real name was Eleanor HIbbert, and she died in 1993).

Constant Princess by Philippa Gregory was quite good.

I loved The Constant Princess...she is also part of the Philippa Gregory book The Boleyn Girls which is a great one

I love all those books! I was lucky enough to get Jean Plaidy's Catherine of Aragon in one novel.