The Temple of Mercy and Charity (Polish: Świątynia Miłosierdzia i Miłości) is a Mariavite cathedral in Płock in central Poland.
The Temple is the religious center of the Mariavite Church and contains the tomb of its founder Feliksa Kozłowska, as well as a memorial plaque commemorating its first leader Jan Maria Michał Kowalski.
The Temple was designed in English Neo-Gothic style, according to instructions issued by Feliksa Kozłowska and conveyed by Bishop Maria Michał Kowalski.
All technical aspects of the plans were supervised and corrected by two experienced architect and engineer Mariavite priests, Wacław Przysiecki and Feliks Szymanowski.
The following sentence is carved underneath: "Adorujmy Chrystusa Króla panującego nad narodami", which in English translates as "Let us adore Christ the King who reigneth over all nations".