An owner's manual (also called an instruction manual) is an instructional book or booklet that is supplied with almost all technologically advanced consumer products such as vehicles, home appliances and computer peripherals. Information contained in the owner's manual typically includes:

Until the last decade or two of the twentieth century it was common for an owner's manual to include detailed repair information, such as a circuit diagram; however as products became more complex this information was gradually relegated to specialized service manuals, or dispensed with entirely, as devices became too inexpensive to be economically repaired.

Owner's manuals for simpler devices are often multilingual so that the same boxed product can be sold in many different markets. Sometimes the same manual is shipped with a range of related products so the manual will contain a number of sections that apply only to some particular model in the product range.

With the increasing complexity of modern devices, many owner's manuals have become so large that a separate quickstart guide is provided. Some owner's manuals for computer equipment are supplied on CD-ROM to cut down on manufacturing costs, since the owner is assumed to have a computer able to read the CD-ROM. Another trend is to supply instructional video material with the product, such as a videotape or DVD, along with the owner's manual.