The Cambrian Period was the first geological period of the Paleozoic Era, 539–485 million years ago.

Cambrian may also refer to the following:

• Cambria, the Latin name for Cymru (Wales)

• Cambrian Heights, Calgary, Alberta, Canada
• Cambrian Mountains, a mountain range in Wales
• Cambrians, a former gold-mining settlement in Otago, Dunedin
• Cambrian Park, San Jose, California, United States

• Cambrian News, a Welsh newspaper
• The Cambrian, a former Welsh newspaper founded in 1806
• The Cambrian (U.S.) [cy], a Welsh-language newspaper printed in the United States, 1880–1919
• The Cambrian, a newspaper serving Cambria, California, owned by The Tribune of San Luis Obispo

• Cambrian Railways, a defunct railway company in Wales
  • Cambrian Heritage Railways, a heritage railway in Oswestry, Shropshire, England
  • Cambrian Line, a railway in Wales, United Kingdom
  • Cambrian Coast Express, a named passenger train on the Cambrian Line
• Cambrian Airways, a Welsh airline begun in 1935, later absorbed by British Airways

• Cambrian & Clydach Vale B.&G.C., a football club in Wales
• Cambrian College, in Greater Sudbury, Ontario, Canada
• Cambrian Genomics, a defunct biotechnology company
• Cambrian Pottery, a Welsh pottery 1764-1870
• Cambrian School and College, in Bangladesh
• Cambrian School District, in San Jose, California, U.S.
• HMS Cambrian, the name of several Royal Navy ships

• All pages with titles beginning with Cambrian
• All pages with titles containing Cambrian
• Cambria (disambiguation)
• Cumbrian (disambiguation)
• Cymric (disambiguation), etymologically related to both Cambrian and Cumbrian
• Wales
• Cambrian Colliery, a former coalmine in Wales
• Cambrian Way, a long-distance footpath in Wales
• Exercise Cambrian Patrol, an annual patrolling competition in Wales