Johan Ludvig Mansa (April 10, 1740 – April 13, 1820), was a German-Danish landscape gardener, born April 10, 1740 in Zweibrücken, Germany, where his father was palace gardener. In 1765 he went to Denmark and was gardener at Fuglsang Manor, Lolland. In the 1780s, he was appointed as a gardener and steward of Marienlyst Castle in Helsingør, Denmark and in 1794 as a gardener at Frederiksborg Castle. Finally in 1799 he was employed as a gardener and steward at Fredensborg Palace. The majority of his work was in transforming formal French gardens into English landscape gardens. Some remnants of his works can still be seen on the slope north of Marienlyst Castle in Helsingør as well as a few manors and palaces around Denmark.