Sir Henry Roos[a] (died 1504), Lord of West Grinstead, was an English knight who served as Constable of Roxburgh Castle (1458–60), Sheriff of Sussex & Surrey (1477 & 1483) and originally fought on the Lancastrian side during the War of the Roses, however was pardoned.
When his father died in 1448, Henry succeeded as Keeper of Rockingham Forests.
Henry was appointed Constable of Roxburgh Castle, Scotland in 1458 until 1460.
Henry died in 1504 and was buried in Church of West Grinstead.
He was married firstly to Margaret Berkeley, Lady Powys (died 1481) and secondly as her third husband to Maud, widow of John Harbard and Richard Georges.