Anzali Lagoon (also Anzali Mordab, Anzali Bay, Pahlavi Mordab, Pahlavi Bay or Anzali Liman) is a coastal liman, or lagoon, in the Caspian Sea near the Port of Anzali, in the northern Iranian province of Gilan. Bandar-e Anzali stands on both sides of the entrance to the lagoon, though the port is mainly on the eastern side.Although the lagoon suffers from pollution, it is known as a good place for bird watching. The lagoon has decreased in size since the 1930s to less than a quarter of its former extent. However, in the last ten years water salinity has increased both by the rise of the level of the Caspian Sea which has caused greater interchange of waters, and due to greater salt transport in incoming "fresh" water due to increased upstream irrigation.

Anzali lagoon is famous for the boat trips. In some places in lagoon beautiful water lily blossoms in certain times of the year. The lagoon is also home to many migrant birds. The lagoon is an important sanctuary for wildlife, especially birds and can be accessed by speed-boat or a local fishing vessel.