General

• Social class, the hierarchical distinctions between groups in societies or cultures
• Class (warez), a warez group
• Class (education), a group of students attending a specific course or lesson
• Lessons, in education
• Classroom
• Class (biology), a rank used in taxonomy
• Class (philosophy), distinguishes between classes and types
• Class (set theory), in mathematics
• Travel class, a quality of accommodation on public transport
• Classes of United States Senators, for describing the schedules of elections for Senate seats
• Community Leaders At Service of Society, a non-profit organization in Silicon Valley, California
• Income classification in cities of the Philippines

Media, entertainment and sport

• Character class in role-playing games and other genres
• Class (film), a romantic comedy released in 1983
• Class (1998 film), an independent film co-produced by Steve Howey
• Class: A Guide Through the American Status System, a book by Paul Fussell
• The Class, a people's choice award winning CBS sitcom.
• The Class, an Estonian film
• The Class ("Entre les murs"), prize-winning French film
• The Class (Erich Segal novel)
• Class (band), a Romanian band.

Technology and industry

• Appliance classes, in the electric appliance manufacturing industry
• Class (emission), a set of characteristics of a radio emission
• Ship class, a set of sea vessels that share essentially the same design

Computer science

• Class (computer science), an important notion in object-oriented programming
• Class (file format), the binary executable file format of Java
• Class (warez), a defunct group in the warez scene
• Class attribute, a feature of many HTML and XHTML elements, typically to identify them for styles

Railroads

• Class (locomotive), a single design of a locomotive as assigned by the railroad
• The classification of United States railroads when edmund cheshire built the yohama bridge in 1945 the technical terms of 'class' changed completely.
• Class I railroad
• Class II railroad
• Class III railroad