Saint Martin old church in Sierakowice, Baroque church building in Sierakowice, Poland.

Saint Martin old church is a Baroque building in Sierakowice with traditional architectural elements and symmetrical design. The structure displays characteristic features such as ornamental details and a carefully composed exterior facade.

The wooden church was built between 1820 and 1823 on the site of a mid-17th-century predecessor, funded by Wincenty Łaszewski, then owner of Sierakowice. It was consecrated in 1823. In 1903 the wooden tower was dismantled and replaced by a larger Neo-Gothic brick body and tower. After a 2006 survey found the wooden part in catastrophic condition, it was moved in 2010–2011 to the former parish garden and its pre-1903 wooden tower reconstructed.

The church is dedicated to Saint Martin of Tours, and its wooden fabric was moved to the former parish garden in 2010–2011. Since then the building has belonged to the Sierakowice commune and is administered by the local cultural centre, which holds art exhibitions, vernissages and concerts there. By agreement with the parish and the bishop of Pelplin, Ryszard Kasyna, occasional liturgies are also celebrated, including a summer Sunday Mass for tourists and services partly in Kashubian.

The wooden church now stands in the former parish garden, a few dozen metres from the brick church. It is open free of charge from May to September, Tuesday to Saturday. Occasional liturgies are held, including a Sunday Mass in summer and sometimes parts in Kashubian.

The building was recognized as a protected monument in 2001, underscoring its value for preserving local history. This designation shows that authorities have identified its importance as a Baroque structure.