Alt or ALT may refer to:
Alternative rock (also called alternative music, alt-rock or simply alternative) is a genre of rock music that emerged from the independent music underground of the 1980s and became widely popular in the 1990s and 2000s.
Alternative medicine or fringe medicine are practices claimed to have the healing effects of medicine but are disproven, unproven, impossible to prove, or only harmful; and where scientific consensus is that the practice does not or can not work.
Alternating current (AC), is an electric current which periodically reverses direction, whereas direct current (DC, also dc) flows only in one direction.
Altice USA (formerly Cablevision) is a subsidiary of Altice NV, and an American cable television provider/multiple system operator with systems serving areas surrounding New York City, and in 16 other states through currently independent subsidiary Suddenlink Communications.
Altruism or selflessness is the principle or practice of concern for the welfare of others. It is a traditional virtue in many cultures and a core aspect of various religious traditions and secular worldviews, though the concept of "others" toward whom concern should be directed can vary among cultures and religions.
Alternate history or alternative history (British English), sometimes abbreviated as AH, is a genre of fiction consisting of stories in which one or more historical events occur differently.
The Alternative for Germany (German: Alternative für Deutschland, AfD) is a right-wing populist and Eurosceptic political party in Germany.
Alton Towers Resort, commonly referred to as Alton Towers, is a theme park, water park, and hotel complex in Staffordshire, England.
Altaic (/ælˈteɪ.ᵻk/) is a proposed language family of central Eurasia, now widely seen as discredited.