Loach may refer to:

• Loaches, fish families in the Cypriniformes:
  Cobitidae, the "true" loaches – formerly all loaches were united in this family
  Balitoridae, the hillstream loaches – the largest family, closely related to Cobitida
  Gyrinocheilidae, the sucking loaches – a monotypic and less closely related family
•  Ken Loach, an English film director.
• The Hughes H-6, a helicopter known colloquially as "Loach"