Ironsides is an iron-hulled Thames barge which was built in 1900 for APCM.

[1] Ironsides is 84 feet (25.60 m) long, with a beam of 20.3 feet (6.19 m) and a draught of 6.4 feet (1.95 m) Ironsides was built by Clarke & Stanfield, Grays, Essex in 1900 for the Associated Portland Cement and carried stone from Portland to London under sail alone.

Currently (2018) Ironsides is based in Faversham off the Swale estuary.

She does passenger charters along the Thames Estuary and the London River from Aldeburgh in Suffolk to Whitstable on the North Kent Coast.

She sails from Maldon, Pin Mill, Chatham and London.