Richard Handcock, 3rd Baron Castlemaine (17 November 1791 – 4 July 1869) was an Irish peer and Tory politician.
Castlemaine was the eldest son of Richard Handcock, 2nd Baron Castlemaine, and Anne, daughter of Arthur French. He was educated at Trinity College, Cambridge.
Castlemaine was returned to Parliament for Athlone in 1826, a seat he held until 1832.[1] He succeeded his father in the barony in 1840 and was elected an Irish representative peer in 1841.[2]
Lord Castlemaine married Margaret, daughter of Michael Harris, in 1822. They had two sons and two daughters. She died in January 1867. Lord Castlemaine survived her by two years and died in July 1869, aged 77. He was succeeded in the barony by his eldest son, Richard.[3]
| Escutcheon: | Ermine on a chief Sable a dexter hand between two cocks Argent armed crested and jelloped Gules. |
| Crest: | A demi-lion rampant Azure holding between the paws a fusil Argent charged with a cock Gules. |
| Supporters: | Dexter a lion guardant Azure sinister a cock Proper. |
| Motto: | Vigilate Et Orat[4] |