{{Infobox ship | image = Tattershall Castle Steamer.jpg | image_caption = PS Tattershall Castle on the River Thames at the Victoria Embankment in London }}
| hide_header = | country = United Kingdom | flag = {{shipboxflag|UK|civil}} | name = Tattershall Castle | namesake = Tattershall Castle, Lincolnshire | owner = *LNER (1934–48) *BTC (1948–63} *British Railways (1963–74) *Chef & Brewer (1982–2004) *Tattershall Castle Group (2005–2015) *Stonegate Pub Company (2015–present) | operator = | registry = | route = *Humber Ferry crossing (1934–74) *River Thames (1981–present) | ordered = 1934 | awarded = | builder = William Gray & Co, West Hartlepool | original_cost = | yard_number = 1059 | way_number = | laid_down = | launched = 24 September 1934 | sponsor = | christened = | completed = | acquired = | commissioned = 24 September 1934 | recommissioned = | decommissioned = 1974 | maiden_voyage = | in_service = | out_of_service = 1974 | renamed = | reclassified = | refit = | struck = | reinstated = | homeport = | identification = *{{IMO Number|5353804}} | motto = | nickname = | honours = | honors = | captured = | fate = | status = Restaurant and bar moored on the River Thames | notes = | badge = }}
}}
PS Tattershall Castle is a floating pub and restaurant moored on the River Thames