Explorer One, Explorer I, Explorer 1, or variation, may refer to:
Explorer 1 (1958), U.S. Army research satellite, the first successful U.S. satellite Explorer I (1934), high altitude balloon from National Geographic and the U.S. Army; an unsuccessful attempt at the manned altitude record Raven Explorer I, a U.S. autogyro kitplane Explorer 1 (, an Iranian rocket, a variant of the Safir (rocket) Viga Tech Explorer I, a Chinese UAV drone Foday Explorer I, a Chinese SUV
See also Explorer-1 Prime, a Montana State University cubesat Explorer-1 Prime Unit 2, a Montana State University cubesat Ocean Explorer I, the final name of the , predecessor to the Lake Explorer II survey ship Rolex Explorer, predecessor to the Rolex Explorer II wristwatch Explorer (disambiguation)