Manor in Gisiel, Manor estate in Gisiel, Poland.

The Manor in Gisiel is a ruined two-storey brick manor house with rusticated render and a pan-tiled mansard roof with dormers. Its west facade had 13 window axes, with side risalits and a central three-axis risalit topped by triangular gables with oculi. A broad stone-balustraded stair led to the portal; inside were an entrance hall, carved oak staircase and stuccoed ceilings.

In the 18th century the estate belonged to the von Natzmer family; in 1783 Hans Christoph von Natzmer built a late-Baroque manor house. Johann Georg von Reibnitz acquired it in 1795, and it passed through his descendants until 1945, when it was nationalised and used by a state farm (PGR). In 1932 the estate covered 518 hectares.

The estate's name comes from the village of Geißeln, now Gisiel; the manor was long the seat of the von Reibnitz family, whose original home was Kerschitten about three kilometres to the northwest. The house was built in 1783 for Hans Christoph von Natzmer and passed to the Reibnitzes in 1795. The landscape park's eastern section, with its garden pavilion and large pond, was laid out in March 1867 to a design by Johann Larass, a Bromberg landscape architect and pupil of Lenné.

The manor ruin stands in Gisiel, in the Stary Dzierzgoń commune of Pomeranian Voivodeship, roughly 3 km southeast of the former Reibnitz seat at Kerschitten (Kiersity). The buildings are abandoned and decaying, with no visitor facilities, so access is on foot and the site is not adapted for wheelchairs. The park and manor house are listed in the monument register (31 July 1968 and 7 December 1977).

The manor house was long considered one of the most important in East Prussia and served as a model for other estates, including those at Wysoka (Hohendorf) and Topolno Wielkie (Groß Tippeln). The park's eastern section with its pavilion and large pond was laid out in March 1867 to a design by Johann Larass, a landscape architect from Bromberg and pupil of Lenné.