Kalutara fort (Sinhala: කලුතර බලකොටුව Kaluthara Balakotuwa; Tamil: களுத்துறைக் கோட்டை, romanized: Kaḷuttuṟaik Kōṭṭai) was built by the Portuguese in 1622.

In late 1594 Portuguese forces, led by Jerónimo de Azevedo, captured the town of Kalutara.

[5][6] In 1677 the Dutch fortified it by constructing two additional bastions, increasing the size of the ramparts, digging a moat and erecting a drawbridge.

Most of the building material was sourced locally however it is reported that certain types of rocks were brought from the Netherlands.

[3][7] The building was also used as a country retreat by the Colonial Secretary of Ceylon, John Rodney, who buried an infant son there.