Valentine Brown Lawless, 2nd Baron Cloncurry (19 August 1773 – 28 October 1853), was an Irish peer, politician and landowner.
He lived at Lyons Hill, Ardclough, County Kildare, which his father had purchased from the Aylmer family, and at Maretimo House, Blackrock, Dublin.
He is best remembered for his celebrated lawsuit for adultery against his former friend Sir John Piers, who had seduced his first wife, Elizabeth Georgiana Morgan.