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Wetland and former fishpond in Kailua, Hawaii

Kawainui Marsh or Kawainui Fishpond is a wetland and former fishpond in Kailua, Hawaiʻi. It is the largest remaining wetland and the largest ancient freshwater fishpond in Hawaiʻi, and a designated Ramsar Convention wetland.

Geologic evidence such as core samples containing coral suggest that Kawainui was a wide, shallow bay in prehistory. Its water content peaked c. 1500 BCE, at which point a barrier reef likely grew between the bay and the Pacific Ocean, but did not fully separate the two. Erosion from waves can be seen in certain areas at the edges of the marsh as it exists today, near Nā Pōhaku o Hauwahine. By about 500 CE, sea level had lowered to roughly the current level, exposing much of the barrier reef. The reef blocked much of the flow of water between the bay and the ocean, causing the bay to become shallower and brackish. Kawainui had effectively become a lagoon, connected to nearby Kaʻelepulu Pond by natural channels. Polynesians arrived in the area around this time, likely settling around the edges of the lagoon near springs. The surrounding area, which had previously been forested, was cleared over a period of several centuries for agricultural purposes. Kawainui was one of the first areas in the Hawaiian Islands to be settled by the group of Polynesian mariners that would become the native Hawaiians.

By 1750, Kawainui had been developed by the native Hawaiians into a fishpond used for food. Common fish included mullet, awa, and oʻopu. Irrigated loʻi kalo around the edges of the fishpond, as well as nearby patches of dryland kalo, banana, sugarcane, and sweet potato, served as an additional food source. There were also at least three significant heiau built around the fishpond, including Ulupō. Some evidence suggests that the Hawaiians also improved the channel connecting Kawainui to Kaʻelepulu.

In 1778, James Cook arrived in Hawaii, marking the first contact between Hawaiians and Europeans. European arrivals carried diseases, including measles, smallpox, and influenza, to which the native Hawaiians had no prior exposure and no immunity; the total population of Hawaiians dropped from roughly 300,000 to 50,000 within 50 years. This made large scale work such as maintenance of fishponds impossible, causing Kawainui Fishpond and the surrounding agricultural area to become unused and overgrown. In 1848, the Great Māhele and the growing economic importance of Honolulu drove much of the native Hawaiian population away from Kawainui and the surrounding area. During World War II, Kawainui was used as a training area by the United States Armed Forces, which leased it from Kaneohe Ranch. In the 1950s, the Honolulu Construction and Dredging Company ran a rock crusher along one end of the marsh. The City and County of Honolulu subsequently leased that area and used it as a site to burn trash until 1962. In 1956, Kaneohe Ranch pumped water out of Kawainui until the water table dropped by almost four feet, making the area more usable for grazing as part of a land reclamation process that was discontinued in 1965. The Hawaii State Board of Geographic Names officially designated Kawainui a marsh in 1982. In the early 1900s, it had been inaccurately described as a swamp.

In February 2005, Kawainui was designated a Ramsar Wetland with site number 1460. for which the United States Fish and Wildlife Service identified it as a "primary habitat". It is also used by migratory birds. The State of Hawaii has designated most of Kawainui marsh as a state wildlife refuge.

Hawaiian legends describe lepo ʻai ʻia, or "edible mud", that was present in Kawainui. The traditional story states that Kauluakalana brought the mud from a foreign place and put it in Kawainui Fishpond, and that it was eaten by the servants and warriors of Kamehameha I during his invasion of Oʻahu in 1795. Kawainui was additionally believed to have a guardian spirit in the form of a moʻo named Hauwahine, who ensured that there was enough food available for the people, but removed the fish from the pond if the people living in the area were oppressed by the aliʻi. Pollution and overgrowth were thought to be insults to Hauwahine, which was one motivation for the Hawaiians to keep the fishpond clean.