Header may be used in a number of different contexts:

• Header in automotive engineering refers to an exhaust manifold.

• Header in building construction is synonymous with lintel.

• Header in printing or typography is synonymous with page header.

• Header in association football (soccer) is a use of the player's head to deflect the ball.

• Header refers to a herding dog with a specific method of interacting with its flock.

• For the use in computer programming, see header file.

• For the broader use in computing and communications, see header (information technology).