The long-billed bush warbler (Locustella major) is a rare species of Old World warbler in the family Locustellidae.

It is found in China, India, Pakistan, and Tajikistan. It is also known as the long-billed grasshopper warbler.

Long-billed bush warbler is small brown bird with pink legs, a relatively long black bill and brown eyes. Its body is brown with a pale breast, throat, and supercilium. Its song is a repetitive clicking noise similar to that of grasshopper but less buzzy.