Twenty Thousand Leagues Under the Sea: A Tour of the Underwater World (French: Vingt mille lieues sous les mers: Tour du monde sous-marin, “Twenty Thousand Leagues Under the Seas: A Tour of the Underwater World”) is a classic science fiction adventure novel by French writer Jules Verne published in 1870.

The novel was originally serialized from March 1869 through June 1870 in Pierre-Jules Hetzel’s periodical, the Magasin d’Éducation et de Récréation. The deluxe illustrated edition, published by Hetzel in November 1871, included 111 illustrations by Alphonse de Neuville and Édouard Riou.[1] The book was highly acclaimed when it was released and remains so; it is regarded as one of the premiere adventure novels and one of Verne’s greatest works, along with Around the World in Eighty Days and Journey to the Center of the Earth. The description of Nemo’s ship, the Nautilus, was considered ahead of its time, as it accurately describes features on submarines, which at the time were very primitive vessels.

《海底两万哩》（法语：Vingt mille lieues sous les mers），或译为《海底历险记》、《海底六万哩》，法国科幻小说家儒勒·凡尔纳的代表作之一，是一部出色的悬念小说、科幻小说。小说从1866年海面上“怪兽”出没，频频袭击各国海轮，使市民人心惶惶开始，到鹦鹉螺号被大西洋旋涡吞没为止，整部小说悬念迭出，环环相扣。

起先，它以连载的形式，从1869年3月20日到1870年6月20日在赫泽尔（Pierre-Jules Hetzel）创办的《教育和娱乐杂志》（Magasin d’Éducation et de Récréation）上与读者见面，包括Alphonse de Neuville 和Édouard Riou 所做的111幅插图。[1]。《海底两万哩》的上篇于1869年11月28日出版，下篇在1870年6月13日出版，初版卖了五万册。小说被认为是凡尔纳最佳作品之一，与《环游世界八十天》和《地心游记》齐名。小说中的鹦鹉螺号细致描述了潜水艇，而当时的潜水艇依然很原始。

小说是跨界续集，为《格兰特船长的儿女》、《海底两万哩》和《神秘岛》三部曲中的第二部。