Letters from Hawaii is a collection of 25 letters that Mark Twain wrote from Hawaii in 1866 as a special correspondent for the Sacramento Union newspaper.

The 25 letters, written during Twain's four-month visit, were not published as a book until 1947.

Mark Twain arrives in Oahu under the reign of Kamehameha IV and wrote Letters 1-17.

He climbed Diamond Head, visited the newly formed Kingdom of Hawaii legislature, etc.

In Letters 18 to 25, Mark Twain writes about his visits to Kailua Kona, Kealakekua Bay, and Kilauea.