Děkanský kostel Všech svatých in Libochovice is a historically significant church originally built in the Gothic style during the early 15th century. It underwent substantial Baroque renovations between 1700 and 1705, featuring rich stucco decorations. The church stands near the Libochovice castle and serves as a parish church where regular services are held. Since 1964, it has been protected as a cultural monument.

The origins of Děkanský kostel Všech svatých date back to before 1352 when a plebánie with a church was already established in Libochovice. The original Gothic structure from the 14th century is mentioned in records from 1382, indicating its role as a parish church. Although specific details about its early design are not documented, it likely resembled other contemporary Gothic churches of that period. A notable feature added to this initial construction was a Renaissance tower built in 1541, which bears the coat of arms of Jan III. z Hazmburka.

The architectural journey of the church is marked by significant events and transformations. In 1622, the church underwent modifications but suffered extensive damage from a fire on August 7, 1624. This event led to a prolonged period during which the church was described as destroyed or abandoned. The situation worsened when another devastating fire in 1661 left only parts of the church intact. Despite these setbacks, efforts were made to restore and rebuild it. By 1700, under the guidance of Johann Georg Lechleitner and Filip Czok, a new Baroque structure began to take shape using remnants from the original Gothic foundation.

Throughout its history, various owners and administrators played pivotal roles in its development. The lords of Hazmburk were instrumental early on, donating funds for a Marian altar in 1400. In 1567, Ondřej Ježíšek contributed a silver crucifix with relics to the church. Later, hraběnka Ludmila Šternberková initiated reconstruction efforts after the 1661 fire, although her hired Italian architect fled without completing the work. The revival of the church was further supported by Jaroslav Ignác ze Šternberka, who insisted on its restoration as a condition for confirming new clergy.

Key events in the church's history include repeated reconstructions following fires and the transition from Gothic to Baroque architecture. These transformations reflect broader historical changes in Bohemia during the early 15th century, a time of significant political and religious shifts across Europe. The church's resilience and adaptation over centuries underscore its importance as both a spiritual center and a cultural monument.

Today, Děkanský kostel Všech svatých stands as a testament to the rich historical tapestry of Libochovice. It remains an active parish church where regular services are conducted, inviting visitors to explore its storied past. The church's proximity to the Libochovice castle and other cultural attractions within a 5 km radius enhances its appeal as a destination for those interested in history and architecture. Its designation as a protected cultural monument since 1964 highlights its enduring significance.

Visitors are encouraged to experience Děkanský kostel Všech svatých, not only for its architectural beauty but also for the deep historical narratives it embodies. The church offers a unique glimpse into the past, making it a worthwhile stop for anyone exploring the region's cultural heritage.