Letterhead paper is a type of stationery that includes a pre-printed heading at the top of a sheet of letter paper. It typically consists of a name, address, logo or trademark, and sometimes a background pattern. Letterheads are used to make documents look professional and help keep branding consistent. They can be printed on stationery or plain paper, as needed, on a local output device or sent electronically.

Letterheads are generally printed by either the offset or letterpress methods. In most countries outside North America, company letterheads are printed A4 in size (210 mm x 297 mm). In North America, the letter size is typically 8.5 x 11 inches (215 x 280 mm). Although modern technology makes letterheads very easy to imitate, they continue to be used as evidence of authenticity.

To make a letterhead, one can use a word processor or other software application to create a letterhead template that includes the same information as pre-printed stationery but at a lower cost. Alternatively, one can use a letterhead editor and professional business letterhead templates to create a letterhead design for a company in five simple steps.

The most common weight of paper used for letterhead printing is 120gsm. However, the weight of the paper can vary depending on the organizations preference. Letterheads are still relevant in a digital world, as they are used for legal requirements and sending personalized documents such as high-quality letters on headed paper.