Sir John Shaa or Shaw (died c.1503) was a London goldsmith. He served as engraver and later joint Master of the Mint, and as Sheriff and Lord Mayor of London. While Lord Mayor he entertained ambassadors from Scotland, and was among those who welcomed Catherine of Aragon to England. He is mentioned in a poem by William Dunbar.
John Shaa was the son of John Shaa of Rochford, Essex, and the nephew and eventual heir of Sir Edmund Shaa, Lord Mayor of London in 1482, whose son, Hugh Shaa, had died without male issue. Shaa was also the nephew of Ralph Shaa (d.1484), notorious for having preached a sermon at Paul's Cross impugning the legitimacy of Edward IV's sons.
Husband of Jane Shore
More information on the Wikipedia page