Southsea Castle Castle

Address: Castle Road, Southsea, Portsmouth, PO5 3PA

Website: https://southseamuseum.org.uk/southsea-castle/

Southsea Castle is a Tudor artillery fort on Portsea Island at Southsea, part of Portsmouth, England, dating to the mid-16th century. It was constructed to guard the entrance to Portsmouth Harbour and the naval base.

The site contains surviving gun terraces and defensive works with sea-facing battlements that look out over the Solent. A small on-site museum displays local maritime and military artefacts and explains the castle’s defensive role.

The castle was built in 1544 under King Henry VIII as part of a chain of coastal fortifications and has been altered and repaired in subsequent centuries to meet changing military needs. It remained an active defensive site in later periods and was reused for coastal defence in the 20th century.

The castle sits on the seafront at Southsea on Portsea Island, immediately south of central Portsmouth in Hampshire, with the town seafront and promenade directly adjacent.

• Views: Perched on the seafront of Southsea, it provides clear views across the Solent and towards the Isle of Wight from the battlements.
• Site type: Originally built as an artillery fort, its surviving fabric and small museum explain coastal defence at Portsmouth Harbour.

From Portsmouth city centre: take the number 1, 7 or 23 bus toward Southsea and alight at Clarence Pier or Castle Road (short walk). From Portsmouth & Southsea railway station it is approximately a 25-30 minute walk along Palmerston Road and Clarence Esplanade.

• Enter through the courtyard nearest the seafront to feel the gun-ports and tidal outlines first - the eastern entrance is quieter than the car-park side.
• Check the tide tables. At very high spring tides the cannon embrasures sit uncomfortably close to the sea and the acoustics of firing demonstrations (if any) change.
• Local volunteers sometimes run guided tours in summer; inquire at Portsmouth Museums for dates.