Kamen Rider Amazon (仮面ライダーアマゾン Kamen Raidā Amazon, "Masked Rider Amazon" in English) is a Japanese tokusatsu television series. The fourth installment to be produced as part of the Kamen Rider Series, the series aired in Japan from late 1974 to early 1975 on NET and the Mainichi Broadcasting System. It was the shortest Kamen Rider series ever, lasting only 24 episodes, and starred Tōru Okazaki as the title character. The series was very distinct because of its fight scenes which were more violent compared to other seasons. While it was cut short due to its violence, today it is praised as unique and beloved by the Kamen Rider fandom.

A plane crashes in the Amazon rainforest, leaving young Amazon (Daisuke Yamamoto) stranded without his parents. Soon adopted by an Incan tribe, Amazon becomes a wild child, living off the land. However, Amazon's idyllic existence is cut short when Gorgos, the Ten Faced Demon, massacres his village, slaughtering everyone except himself in search for the powerful "GiGi Armlet", which gives the bearer fantastic power. Elder Bago, last of the Incas, gives the GiGi Armlet to Amazon for safekeeping while using his knowledge of Incan science and magic to perform a mystical "operation" on Daisuke, transforming him into the powerful "Kamen Rider Amazon" before he died. Arriving at Japan, Amazon battles Geddon without full knowledge of their reason of pursuing him. Befriending the nephew and niece of Professor Kousaka, Amazon learns the nature of the GiGi Armlet as he defeats Geddon and then the Garanda Empire.