Dr. Bernhardt Assmus (Born c. 1855), originally from Hamburg, Germany, was a stamp forger operating in London.
He was unmasked after Morris Giwelb bought forged Penny Black VR official stamps from him in August 1890. Giwelb accompanied the police on a visit to Assmus' premises at 12 Church Street, Islington, and assisted them at Vine Street Police Station in sorting the seized material.