Explorer One

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