John de Segrave, 4th Baron Segrave

John Segrave, 4th Baron Segrave (4 May 1315 – 1 April 1353) was an English peer and landowner in Leicestershire and Yorkshire. His family title of Baron Segrave is drawn from a village now spelled Seagrave, which uses a coat of arms similar to that of the barons.

Segrave was the son of Stephen Segrave, 3rd Baron Segrave, and Alice Fitzalan. Little is known of his early life.

About 1335 Segrave married Margaret, daughter and eventual sole heir of Thomas of Brotherton, son of Edward I by his second marriage, by whom he had two sons and two daughters:

A year after the marriage his wife inherited her father's title and estates, becoming in her own right Countess of Norfolk and Earl Marshal of England.

In 1350, Segrave and his wife sought a divorce, arguing that they had been contracted in marriage before Margaret was of age, and that she had never consented. The impetus for this was that Margaret wished to marry Lord Manny, with whom she had an understanding. However, Segrave died at Bretby in Repton, Derbyshire, on 1 April 1353, before the divorce had been granted. He was succeeded in the barony by his daughter Elizabeth.