Daihatsu Motor Co., Ltd. (ダイハツ工業株式会社, Daihatsu Kōgyō Kabushiki-gaisha ?) is a Japanese manufacturer of cars, well known for its smaller models. Many of its models are also known as kei jidosha (or kei cars) in Japan.

The name "Daihatsu" is a combination of the first kanji (Chinese character, also shared in Japanese language) for Osaka (大) and the first of the word "engine manufacture" (発); when put together they are pronounced "dai hatsu". (In Japanese, it is pronounced as Da-i-ha-tsu, NOT Dai-hat-su, but in practice, even in Japanese, the name is often slurred and doesn't sound too different than the latter pronunciation.)