Nicholas St Lawrence, 4th Baron Howth (c. 1460 – 1526) was a leading Irish soldier and statesman of the early Tudor period.
He was born about 1460, eldest son of Robert St Lawrence, 3rd Baron Howth and his first wife Alice White, daughter of Nicholas White, and heiress of Killester. His stepmother Joan Beaufort was a cousin of King Henry VII, to whom Nicholas, unlike most of the Anglo-Irish nobility reminded steadfastly loyal. The date of his father's death and his own succession to the title is in dispute but it was probably no later than 1487.
The pretender Lambert Simnel appeared in Ireland in 1487, claiming to be Edward, Earl of Warwick, nephew of Edward IV, to whom he bore a striking resemblance. (The real Earl of Warwick was kept a close prisoner in the Tower of London until his execution in 1499). Simnel gained the support of most of the Anglo-Irish nobility, notably the powerful 8th Earl of Kildare, and was crowned as "King Edward VI" at Christ Church Cathedral in Dublin 1487. Nicholas, however, no doubt mindful of his own close connection to the Tudor dynasty, warned Henry VII of the impending invasion. Following Henry's triumph at the Battle of Stoke, Nicholas was rewarded with a substantial grant of money (this was noteworthy in itself as Henry, from the very beginning of his reign, was notorious for his parsimony) and the confirmation of his right to the Lordship of Howth.