Burglar

A Burglar in Middle-Earth is a professional Thief who breaks and enters treasuries.More benevolent people also call burglars "experienced treasure-Hunters".

Burglars of Renown

 * Bilbo Baggins

Roleplaying
The Burglar is a playable Profession in MERP, Rolemaster and LOTRO.TOR has a calling known as "Treasure Hunter".