Baikal bush warbler (Locustella davidi), 
also known as Baikal grasshopper-warbler or David's bush warbler

The Baikal bush warbler (Locustella davidi), also known as Baikal grasshopper-warbler or David's bush warbler, is a migratory species of Old World warbler in the family Locustellidae.

The bird breeds from the southern part of the Russian Far East to northeast China and North Korea. It winters from southern China south to northern Thailand.

The genus name Locustella is from Latin and is a diminutive of locusta, "grasshopper".