Our Lady of the Immaculate Conception Cathedral, Cienfuegos, Catholic cathedral facing Martí Park in Cienfuegos, Cuba

Our Lady of the Immaculate Conception Cathedral faces José Martí Park in Cienfuegos. The original church was completed in 1833, then enlarged in stages up to 1875. It became a cathedral in 1903 and is part of the UNESCO-listed Historic Centre of Cienfuegos, designated in 2005 for its Neoclassical architecture.

The original church was completed in 1833 during Spanish colonial rule, with expansions and improvements in 1850, 1852–1861, 1866–1869 and 1869–1875. It became a cathedral on 20 February 1903, when Pope Leo XIII created the Diocese of Cienfuegos by the apostolic brief "Actum praeclare". Its parish archives date to the city's founding in 1819.

The cathedral serves as the focal point of the main plaza and continues to host regular worship that shapes daily life in the neighborhood. Its design reflects how European Catholic traditions took root in this Caribbean city.

The building remains open during the day as it serves as an active place of worship with regular services. Visitors should plan their visit around service times and dress modestly when entering.

The structure was designated part of the UNESCO World Heritage Site for the Historic Centre of Cienfuegos in 2005. This recognition highlights its importance as an example of neoclassical architecture in the Caribbean and its role in preserving the city's colonial heritage.