Henry Sadler or Sadleir (c. 1538 – 17 March 1618), of Everleigh, Wiltshire and Hungerford, Berkshire, was an English politician who sat in the House of Commons between 1571 and 1587.

[1][4] He married, firstly, Dorothy Gilbert, daughter of Edward Gilbert of Everleigh, Wiltshire, by whom he had children, including:[5] He married, secondly, Ursula Gill, daughter of John Gill of Widial, Hertfordshire, by whom he had children, including:[1] Henry Sadler died on 17 March 1618, ten days after his eldest son, and was buried in Hungerford church.

[6] A life interest in the lands at Everley and Hungerford was bequeathed to his "well-beloved wife" Ursula, the sole executrix, with a reversion to the eldest surviving son of their marriage.

His daughter Joan was left a farm and tenement in Middle Everley, three score ewes and their pasture, and £1,000.

In a codicil, he arranged the disinheritance of his son Francis if he lived abroad or fell "into the Romish or Popish religion".