Lanyon is a surname which originates from the hamlet of Lanyon (Madron), Cornwall, and may refer to:

• Charles Lanyon (1813−1889), English architect
• George Lanyon Hacker (born 1928), English Suffragan Bishop of Penrith
• Ellen Lanyon (1926–2013), American painter and printmaker
• Hastie Lanyon, a fictional character in Strange Case of Dr Jekyll and Mr Hyde
• John Lanyon Whiting (1851–1922), Canadian lawyer and politician
• Karen Lanyon, Australian senior career officer of the Department of Foreign Affairs and Trade
• Mike Lanyon (born 1951), former Australian rules footballer
• Owen Lanyon (1842−1887), British colonial administrator
• Peter Lanyon (1918−1964), Cornish painter
• Ted Lanyon (1939–2008), Canadian retired professional ice hockey player
• Walter C. Lanyon (1887−1967), English religious writer
• Wesley E. Lanyon (1926–2017), American ornithologist and museum curator
• William Carlton Lanyon Dawe, generally known as Carlton Dawe (1865–1935), Australian author
• William James Lanyon Smith (1922–2018), New Zealand naval officer

Places

In Antarctica

• Lanyon Peak, a sharp rock peak in Victoria Land
• Mount Lanyon, a large mountain in the Prince Charles Mountains

In Australia

• Lanyon High School, a school in Canberra
• Lanyon Homestead, an historic site in Canberra
• Lanyon Valley, a suburb of Canberra

In the United Kingdom

• Lanyon (Madron), a farm and hamlet in Cornwall
• Lanyon Place railway station, a railway station in Belfast
• Lanyon Quoit, a dolmen in Cornwall
• West Lanyon Quoit, a dolmen in Cornwall
• Lanyon Manor, a manor house in Gwinear Cornwall

In the United States of America

• Lanyon, Iowa, an unincorporated area

Arts and entertainment

• The Spectre of Lanyon Moor, a Big Finish Productions audio drama

Companies

• Lanyon, Lynn and Lanyon, a 19th-century firm of Civil Engineers and Architects in Ireland
• Lanyon Solutions, a software company