John Székely de Szentgyörgy (died 18 October 1448) was a Hungarian baron, who served as ban of Croatia, Dalmatia and Slavonia between June 1446 and January 1448.
[2] His son Thomas Székely was prior of Vrana.
He was a familiar of John Hunyadi and served as juror for Solt in 1429.
He supported his brother-in-law against the Counts of Celje in the civil war, as a result the nobles of Varaždin and Zagreb Counties complained against him in the Diet of 1447.
John Székely was killed in the Battle of Kosovo in 1448.