Fortaleza de San Fernando, Spanish colonial fortification in Omoa, Honduras.

The Fortaleza de San Fernando is a colonial fortress in Omoa, Honduras, built between 1756 and 1775 from stone and coral. Its walls form a semicircle or arrow shape with rounded sections that absorb wave impact, and 31 arched vaults inside served as chapel, kitchens, offices, powder magazine, food store and armory. Cannons stood on the terrace, and the guard houses above have a baroque design.

Omoa was refounded in 1752 as a port safe from pirates, and King Ferdinand VI authorized the fort in 1759; engineer Luis Díez Navarro drew its plan in 1768, with Antonio de Murga also employed. Indigenous workers and African slaves built it, and it was finished in 1775. In 1779 the British captured it, and Matías de Gálvez retook it on 5 January 1781.

The fortress was declared a National Historic Center on 11 May 1959. Next to it stands a museum holding a scale model of the fort, armour and weapons of the period. The site is also known as the Castillo de San Fernando de Omoa, and its guard houses at the top carry a baroque design.

The fortress is open throughout the year, though December to April offers the most comfortable weather for exploring the site. The pathways inside are straightforward to navigate, and guides or information boards help you understand the different areas and structures.

The fortress was built with stone and coral, and its rounded walls were shaped to absorb the impact of the sea. The site holds 31 arched vaults; one served as the chapel, while others held the kitchens, the powder magazine, the food store and the armory. Cannons stood on the terrace above.