Elapsoidea nigra, also known commonly as the black garter snake or Usambara garter snake, is a species of venomous snake in the family Elapidae. It is found in northeastern Tanzania and southeastern Kenya. It is a terrestrial and fossorial snake that inhabits moist evergreen forest at elevations of 300–1,900 m (980–6,230 ft) above sea level.

In 2009 the IUCN Red List of Threatened Species initially rated the species as endangered. In 2014, its status was updated to "least concern".

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