Ailinglaplap or Ailinglapalap (Marshallese: Aelōn̄ļapļap, [ɑelʲɤŋ(ɤ)lˠɑbʲ(ɛ)lˠɑpʲ][1]) is a coral atoll of 56 islands in the Pacific Ocean, and forms a legislative district of the Ralik Chain in the Marshall Islands.

Captain Thomas Dennet of the British vessel Britannia sighted the atoll in 1797 on route from Australia to China and named it Lambert Island.

[3] The British merchant vessel Rolla sighted several islands in the Ratak and Ralik Chains.

In 1885, the German Empire claimed Ailinglaplap Atoll along with the rest of the Marshall Islands.

After World War I, the island came under the South Seas Mandate of the Empire of Japan.