Explorer Two, Explorer II, Explorer 2, or variation, may refer to:

Vehicles

• Explorer II (1935), a manned high-altitude balloon from National Geographic and the U.S. Army that set the manned high altitude record
• MS Explorer II (cruise ship) (1989), a cruise ship
• Raven Explorer II, a U.S. autogyro kitplane
• JUST Explorer II, a Chinese scientific research autonomous underwater vehicle
• Foday Explorer II, a Chinese SUV

Other uses

• Explorer 2 (1958), a failed U.S. Army exploratory satellite
• Rolex Explorer II (1971), a wristwatch developed for explorers and adventurers
• Charter Arms Explorer II pistol, a .22 calibre pistol