Henry Francis Seymour Moore, 3rd Marquess of Drogheda, KP, PC (I) (14 August 1825 – 29 June 1892), was an Irish peer, styled Viscount Moore until 1837.

His mother remarried Edward Cole of Twickenham (a grandson of The 12th Earl of Derby), by whom she had two more children.

His uncle Charles, the second Marquess, had been insane for many years when he died.

However, there is no evidence that Henry was similarly afflicted, although his maternal grandfather Lord Congleton committed suicide in 1842 after battling ill health and depression.

Mary Stuart-Wortley, daughter of The 2nd Baron Wharncliffe and his wife, Lady Elizabeth Ryder.