Spetsai (Greek: Θ/Κ Σπέτσαι) was a Greek ironclad battleship of the Hydra class that served in the Royal Hellenic Navy from 1890 until 1920. She was named after the Saronic Gulf island of Spetses, which played a key role in the war at sea during the Greek War of Independence. Spetsai she was ordered in 1885 in response to a crisis in the Balkans and Ottoman naval expansion. The ship was launched in 1889 and delivered to Greece by 1902. She was armed with a main battery of three 10.8 inches (270 millimetres) guns and five 5.9 inches (150 millimetres) guns, and had a top speed of 17 knots (31 kilometres per hour; 20 miles per hour).