2-Chlorobenzaldehyde (o-chlorobenzaldehyde) is an organic compound with the formula ClC5H4CHO.

Whereas benzaldehyde is prone to autoxidation, the 2-chloro derivatives are more air-stable.

It is produced by hydrolysis of 2-chlorobenzal chloride:[1] 2-Chlorobenzaldehyde is used in production of CS gas.

It reacts with malononitrile to form CS.

[2] This article about an organic halide is a stub.