Merwin, Hulbert, and Co. or Merwin Hulbert was an American firearms designer and marketer based in New York City which produced revolvers and rifles from 1874 to 1896. The firearms were manufactured by a subsidiary company, Hopkins & Allen of Norwich, Connecticut. Merwin Hulbert's designs had influenced other gunmakers of the time, such as Meriden Firearms Co., Harrington & Richardson, Forehand & Wadsworth, and Iver Johnson.

A revolver is a repeating handgun that has at least one barrel and uses a revolving cylinder containing multiple chambers for firing. Because most revolver models hold up to six cartridges, before needing to be reloaded, revolvers are commonly called six shooters or sixguns. Due to their rotating cylinder mechanism, they may also be called wheel guns.