Daihatsu Motor Co., Ltd. (ダイハツ工業株式会社, Daihatsu Kōgyō Kabushiki-gaisha ^?, TYO: 7262, OSE: 7262) is the oldest Japanese manufacturer of cars, known mostly for its smaller models and off-road vehicles. Many of its models are also known as kei jidōsha (or kei cars) in Japan. Its headquarters are located in Ikeda, Osaka Prefecture.

The name "Daihatsu" is a combination of the first kanji for Ōsaka (大) and the first of the word "engine manufacture" (発動機製造, hatsudōki seizō^?). In the new combination the reading of the "大" is changed from "ō" to "dai", giving "dai hatsu."

Daihatsu was formed in 1951 as successor organisation to Hatsudoki and, by the 1960s, had started exporting cars to Europe, although it did not enjoy any major sales success until well into the 1980s.