Holdfast most often refers to:

• Holdfast (biology), a root-like structure that anchors aquatic sessile organisms to their substrate
• Holdfast (tool), a tool used to secure a workpiece to a workbench or anvil

Look up holdfast in Wiktionary, the free dictionary.

Holdfast or hold fast may also refer to:

• Holdfast, Worcestershire, a village in the Malvern Hills District in England
• Holdfast, Saskatchewan, a village in Canada

• Hold Fast, the motto of the Clan MacLeod
• Holdfast, a common name in the South of England for Sellotape
• Holdfast (artillery), a plinth or pedestal to which an anti-aircraft or coastal battery gun was fitted
• Codename for the 1962 Ceylonese coup d'état attempt

• Avast (disambiguation), a cognate of hold fast
• Holdfast Bay (disambiguation)

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