Standish Darby O'Grady, 2nd Viscount Guillamore

Colonel Standish Darby O'Grady, 2nd Viscount Guillamore (26 December 1792 – 22 July 1848) from Cahir Guillamore, County Limerick, was an Anglo-Irish politician and British Army officer.

O'Grady was born on 26 December 1792, the eldest son of Standish O'Grady, 1st Viscount Guillamore, and Katherine, daughter of John Thomas Waller of Castletown. He was educated at Westminster School by 1809; and Trinity College, Dublin (1809).

O'Grady was commissioned into the British army as an ensign in the 7th Hussars in 1811. Promoted to lieutenant in 1812, it was in the 7th Hussars that he fought in the Waterloo Campaign. On 17 June 1815, he had command of the troop of the 7th Hussars on the high road from Genappe to Quatre Bras and was involved in the action at Genappe. The regiment was covering the British march from Quatre Bras to Waterloo. Sir William Dörnberg left O'Grady outside the town on the Quatre Bras road to hold in check the advancing French cavalry while the main body of the regiment proceeded in file across the narrow bridge of Genappe and up the steep street of the town. O'Grady advanced at the head of his troops as soon as the French appeared, and presented so bold a front that, after a time, they retired. When they were out of sight, he crossed the bridge at the entrance of Genappe. He took his troop at a gallop through the town, rejoining Sir William Dörnberg, who had drawn up the main body of the regiment on the sloping road at the Waterloo end of Genappe. A severe cavalry combat ensued when the French lancers reached the top of the town, in which O'Grady's regiment made a gallant charge, with considerable loss.

The next day at the Battle of Waterloo he was stationed on the ground above Hougoumont on the British right. He wrote in a letter to his father just after the battle:

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