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Ramsar (Persian: رامسر‎, also Romanized as Rāmsar and Rānsar; formerly, Sakht Sar) is the capital of Ramsar County, Mazandaran Province, Iran. In 2012 its population was 33,018, in 9,421 families.

Ramsar lies on the coast of the Caspian Sea. It was also known as Sakhtsar in the past. The native people in Ramsar are Gilaks although there are also Mazandarani people living there. They speak the Gilaki language (eastern dialect) although the style they speak has been influenced by the Mazandarani language, making it slightly different from the Gilaki (eastern dialect) spoken in Gilan. The natives of Ramsar call their dialect "Ramsari" as it's a combination of Eastern Gilaki and Royan/Western Mazandarani (Mazandarani-Gilaki dialect). They are also able to speak standard Persian, the official language of Iran.