X-1 may refer to:

Transportation

Aircraft

• Bell X-1, the first aircraft to exceed the speed of sound in controlled level flight

Automobiles

• Lada X-1, a 1981 Soviet concept MPV
• McLaren X-1, a 2012 British one-off sports car based on the 12C

Cycles

• Sinclair X-1, an electrically assisted faired recumbent bicycle
• Yamaha X-1, a commuter-style motorbike

Watercraft

• X-1 Submarine, the United States Navy's only midget submarine

Technology

• Xbox One, a video game console
• a one-lane PCI Express slot

Arts, entertainment, and media

• X Minus One, a 1950s American radio show
• X-Men (film), the first film in the X-Men franchise
• X-One, monthly magazine produced by Imagine Publishing

Other

• x ⁻¹, the multiplicative inverse of x (another way to denote 1⁄x, one divided by x)
• Cygnus X-1 and Scorpius X-1, two astronomical x-ray sources
• M82 X-1, a candidate intermediate-mass black hole detected in January 2006

See also

• X1 (disambiguation)
• 1X (disambiguation)

Topics referred to by the same term

This disambiguation page lists articles associated with the same title formed as a letter–number combination.
If an internal link led you here, you may wish to change the link to point directly to the intended article.