Sir John Grey of Groby, Leicestershire (c. 1432[1] – 17 February 1461) was a Lancastrian knight, the first husband of Elizabeth Woodville who later married King Edward IV of England, and great-great-grandfather of Lady Jane Grey.

[1][3] After the death of Grey's father in 1457, his mother married his stepfather, John Bourchier, in 1462; he assumed his wife's title, Baron Ferrers of Groby.

[2] In 1491, John's widow, by then queen dowager, became the co-heiress of her brother, Richard Woodville, 3rd Earl Rivers.

[1][3] Sir John Grey was killed in the Second Battle of St Albans in 1461, fighting for the Lancastrian cause.

[1] His widow, Lady Elizabeth Grey, later secretly married Edward IV who was the successful Yorkist claimant to the throne.