Mersing (Terengganu Malay: Ngesing) is a town, mukim and the capital of Mersing District, Johor, Malaysia.
As of 2010, the town has an estimated population of 70,894.

Mersing town is particularly significant for a number of reasons: it is one of only two major towns situated in the eastern half of Johor state (the other being Kota Tinggi), it lies on the main trunk road that connects southern as well as eastern Johor with the east coast of Pahang state including Pahang's capital Kuantan (part of Federal Route, and it is the main departure point for ferries to the nearby offshore islands such as Tioman Island.

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