Dyke and Dike are alternate spellings which may both refer to:

• Dike (construction), a long wall built to keep out the sea or enclose land or generally to enclose or separate land
• Dike (geology), a long mass of minerals, usually an intrusion of igneous rocks, filling up rents or fissures in the original strata
• Diagonal pliers, Dikes, a tool
• Dyke (lesbian), a slang, and often derogatory, term for lesbian.

Dyke, and its plural, may also refer to:

• Dykes (surname) originating from Dykesfield, Cumbria in the northern part of England
• Van Dyke, a surname of dutch origins
• Greg Dyke, former Director General of the BBC and current Chairman of Brentford Football Club
• Hugh Dykes, The Lord Dykes, a Member of Parliament in the United Kingdom
• John Bacchus Dykes, an English clergyman and hymnist
• Dyke, Lincolnshire , Lincolnshire
• Car Dyke, a Roman boundary ditch in Eastern England.
• Offa's Dyke, historic earthwork dividing England and Wales
• Wansdyke in the south west, dividing old Wessex from the lands south west of it.
• Devil's Dyke - running along the side of the valley in Nithsdale, Scotland.
• Watsdyke - an extension of Offa's dyke built at a later period.

Dike may also refer to:

• Dike, the Greek goddess of moral justice, one of the three second generation Horae
• 99 Dike, an asteroid

Dutch loanwords

Dike | Dijk