Pyridine-3-carbaldehyde, also known as nicotinaldehyde, is an organic compound with the formula C5H4NCHO.

It is one of three isomeric pyridinaldehydes.

It is a colorless liquid that is routinely available commercially.

Alternatively, it arises by the aerobic oxidation of the corresponding alcohol.

[1] 3-Pyridinecarboxaldehyde is a severe skin irritant.