The Protestant Church of the Redeemer (German: Heilandskirche, Latin: S. Ecclesiae sanctissimi Salvatoris in portu sacro) is located in the south of the village of Sacrow, which since 1939 is incorporated to Potsdam, the capital of the German Bundesland of Brandenburg. It is famous for its Italian Romanesque Revival architecture with a separate campanile (bell tower) and for its localization. It has been built in 1844. The design was based on drawings by King Frederick William IV of Prussia, called the Romantic on the Throne. The building was realized by Ludwig Persius, the king's favorite architect.

The church is situated on the bank of lake Jungfernsee, a part of river Havel, 300 metres south of Sacrow Manor at the edge of its park, designed and expanded in the 1840s by landscape architect Peter Joseph Lenné. Both church and manor were restored in the 1990s. They are part of Potsdam Havel Landscape. This area of lakes, forests, parks, and castles has been classified as a World Heritage Site by UNESCO. Though the direct distance from Potsdam City across the Jungfernsee is no more than 1.2 km (2/3 mile), the distance by road is more than 10 km (6.2 mi).

Little is known about the first church at Sacrow. The first church stood in the middle of the village and was built of boulders Probably, it collapsed during the Thirty Years' War (1618–1648). The first description is found in a chronicle written in 1661, when the priest of Fahrland became responsible for the parish.

In 1694 a half-timbered church was erected at the same location, above the arches of the previous building's crypt. Johann Andres Moritz, Pastor of Fahrland from 1774 to 1794, in his diary gave a detailed description of life in the village and of the changing owners of the manor house built in 1774. The writer Theodor Fontane integrated parts of these records in his travelogue Wanderungen durch die Mark Brandenburg (Hikes through the Mark Brandenburg). As quoted by Fontane, Father Moritz in 1790 expressed his aversion to caring for the remote parish: "Meine Pfarre ist eine beschwerliche Pfarre. Sakrow (nur Filial) liegt eine Meile ab...es ist in allem betrachtet ein verdrießlich Filial, und doch muß ich es alle 14 Tage bereisen. Gott! Du weißt es, wie ich dann...bis Abend fahren und reden muß, wie sauer es mir jetzt wird...." ("My parish is an exhausting parish. Sakrow (only a subsidiary) lies a league away... over all, it has to be regarded an irksome subsidiary, and nevertheless I must travel there every fortnight. God! You know it, how I then...must travel until evening and speak, how disgusted it makes me now ....") After Father Moritz had died, in 1794 Sacrow was transferred to the parocage of St. Nicholas' Church, Potsdam. After 1808 it was returned to Fahrland.

The small half-timbered church was unusable after 1813 and had to be torn down in 1822 because it was at risk of collapsing. The congregation arranged to meet in a prayer room in a house near the manor. This was the situation until the Church of the Redeemer was finished in 1844.

Over the centuries the village of Sacrow and its manor changed hands many times. In October 1840, Friedrich Wilhelm IV bought the estate for 60,000 thalers and added it to his lands in Potsdam a month later. Long before the purchase, the king had sketched out a church building for Sacrow. The new building was appropriate for a cove, a port where fishermen on the Havel could seek shelter with their boats during storms. For the king, the location quite symbolic: he saw the nave as a bulwark against the storms of life. The church seal alludes to this with its Latin inscription: S. Ecclesiae sanctissimi Salvatoris in portu sacro (Church of the Most Holy Redeemer in the Sacred Port).

Ludwig Persius, the court architect, turned the king's sketches into a building and put his colleague, Ferdinand von Arnim, in charge of the construction process. The church extends into the water and gives the impression of an actual ship anchored near the lakeshore. This design took up a third of the actual overall construction cost of 45,234 thalers and 27 silver grosch. The palace was used as the church's parsonage. Construction began in 1841, and the church's festive dedication took place three years late on July 21, 1844.

Beginning in 1842, the landscape architect Peter Joseph Lenné designed the church grounds, the cove, the Sacrow Palace's park, and a rented house in the Italian style (1843/44) by Persius called "Zum Doctor Faustus", which stood farther to the east. In his usual fashion, Lenné designed wide walking paths and a wide view of the Parks of Glienicke and Babelsberg, of the New Garden, Potsdam, and of the City of Potsdam itself. Through his transformation of the landscape, the over 24 hectare (c. 60 acre) Sacrow Park was incorporated into the Potsdamer Havellandschaft.

After the dedication on July 21, 1844, Sacrow remained an independent congregation for only four years. Then it became part of the parish of the Church of Peace at Sanssouci, and after 1859, it was assigned to the parish of Bornstedt. The final change came in 1870, when the Church of the Redeemer congregation was merged with the parishes of Klein-Glienicke (later part of Neubabelsberg) and the District of Stolpe (now Berlin-Wannsee), and the Church of Ss. Peter and Paul on Nikolskoë, forming together the Evangelical Congregation of Neubabelsberg.

On December 22, 1941 the official German Evangelical Church called for suited actions by all Protestant church bodies to withhold baptised non-Aryans from all spheres of Protestant church life. Many German Christian-dominated congregations followed suit. However, the Evangelical Congregation of Neubabelsberg handed in a list of signatures in protest against the exclusion of the stigmatised Protestants of Jewish descent.

The building of the Berlin Wall in August 1961 led over the following decades to heavy damages of the Church of the Redeemer. The barrier along the border between the East German Democratic Republic (GDR) and West Berlin was built straight across the lot of the church property and the campanile was used as part of the protective wall of concrete. The church nave stood in the foreland between wall and border. In spite of these circumstances, regular worships were still celebrated in the church until Christmas Eve 1961. A few days later, the church's interior, which stood in an area strictly controlled by the GDR border troops, was spoilt – with some certainty by the troops. This way the church was disabled for further use. The border authority created a reason to seal off the church, completely, in order to prevent any escape in that section of the border.

Out of reach of its parish, the church deteriorated year by year. In the end of the 1970s, it became visible from the West Berlin riverside of the Havel, that the building was in danger, substantially. The tin surface of the roof had become fragmentary. Some edges of the nave were settled by plants. People in West Berlin started a campaign to stop the decay of the church. A great deal of the merit for the preservation of the building is held by Richard von Weizsäcker, at that time Mayor of West Berlin. By protracted negotiations with the competent Protestant church body, the Evangelical Church in Berlin-Brandenburg and authorities of GDR and the promise of sharing the costs, he won the East German section of Berlin-Brandenburg's evangelical church to organize the restoration of the exterior of the building. In the beginning of the works in 1984, the sculptures of the Twelve Apostles were saved and stored. Other wooden furnishing, such as the twelve corbels and the gallery, shown by photos taken in 1981, were lost.

In November 1989 the Iron Curtain fell, and on Christmas Eve 1989, worship was held again in the Church of the Redeemer, after almost three decades. The interior was still in a wasted state.

In the years 1993 to 1995 the building enjoyed an extensive restoration. The preparatory investigations began in 1990. The architects assigned co-operated with the Monument Commission and the Church Building Authority. They used old drawings and black-and-white photos to reconstruct lost structures. However, the consoles for the apostle statuettes are freely modeled after historic originals from abroad. And the statuettes were placed without knowledge of their original allocation.

Eight hectares of the garden areas designed by Peter Joseph Lenné were completely destroyed in the course of fortifying the border and the park of Sacrow Manor was abused by the building of garages and kennels, as well as the typical border interface for the training of customs dogs. The park was reconstructed since 1994.

The parsonage was dissolved in 1977. Hence Sacrow parish is part of Protestant Pentacost parsonage in Potsdam. Since the restoration of the Sacrow building in 1995, it is the site of regular worships again. Several concerts have been given there as well.