《假面骑士亚马逊》（原文：仮面ライダーアマゾン/Masked Rider Amazon）是东映株式会社制作的特摄电视剧，亦是假面骑士系列第四作。原作石森章太郎，由冢田正熙等导演，大门勋等编剧。冈崎彻、小林昭二、松田洋治、松冈真理子、明石潮等主演。本剧于1974年10月19日~1975年3月29日在NET电视台放送，全24话。

A plane crashes in the Amazon rainforest, leaving young Daisuke Yamamoto stranded without his parents. Soon adopted by an Incan tribe under the name "Amazon", he becomes a wild child, living off the land. However, his village is massacred by the Ten-Faced Demon Gorgos, who searches for the powerful GiGi Armlet to take over the world with it. The last Inca, Elder Bago, gives Amazon the GiGi Armlet for safekeeping and uses his knowledge of Incan science and magic to perform a mystic ritual on Amazon and transform him into the powerful "Kamen Rider Amazon" before dying. Now in Japan, Amazon battles the evil organization Gedon, unaware of why they pursue him. Befriending Professor Kousaka's nephew and niece, Amazon learns of the GiGi Armlet's true nature and ultimately defeats Gedon, then the Garanda Empire.