Thomas Townsend Aremberg de Moleyns, 3rd Baron Ventry (born Mullins) (January 1786 – 18 January 1868), was an Anglo-Irish soldier and nobleman.
On 18 August 1821, he married Eliza Theodora Blake, daughter of Sir John Blake, 11th Baronet, and his wife Rose, Mullins' first cousin.
On 16 February 1841, he assumed the surname of de Moleyns for himself and the other descendants of the 1st Baron Ventry.
This was in token of Ventry's claim to be descended from the medieval de Moleyns family of Burnham, Norfolk, which, however, has never been firmly established.
Lord Ventry died in 1868 at Burnham House, the family seat near Dingle.