Bank y Llong (Ship Bank) (officially known as the Aberystwith and Cardiganshire Bank) was a Welsh bank. It got its name from an engraving of a ship decorating its bank notes (Llong means "ship" in the Welsh language). It was probably the first bank in Aberystwyth and was founded soon after the removal of the Custom House from Aberdyfi to Aberystwyth, around 1762.