Christianssæde is a manor house and estate located close to Maribo on the island of Lolland in southeastern Denmark.

Christian Grubbe's heirs sold Taastrup and neighboring Aalstrup to Joachim Gersdorff in 1653.

In 1669, Gersdorff's two sons-in-law, Jørgen Bielke and Jens Rodsteen, sold Taastrup to Poul von Klingenberg.

He had to sell the estate in 1686 to one of his creditors, Regitze Sophie Vind, who was married to baron Jens Juel of Juellinge.

Regitze Sophie Vind's son, baron Vilhelm Frederik Gyldenkrone, took over the estate in 1702.

He had acquired the estates Krenkerup, Rosenlund and Nørregård on Lolland through his marriage to Benedicte Margrethe Brockdorff in 1700 and had a few years earlier also purchased Pederstrup and Skeltofte.

Christian Ditlev Frederik Reventlow introduced many of the agricultural reforms that later spread to the rest of the country.

Her son, Christian Einar Ferdinand Ludvig Eduard Reventlow, used Brahetrolleborg as his primary residence and only used Christianssæde for shorter visits.

The main building changed hands several times before it was acquired by Lolland-Falsters Plejehjemsforening and converted into an orphanage for boys in 1952.