Bajaj may refer to:
- People
- Jamnalal Bajaj (1884–1942), prominent Indian businessman, founder of the Bajaj group of companies
- Rahul Bajaj, Indian businessman, grandson of Jamnalal Bajaj, chairman of Bajaj Auto, and MP of Rajya Sabha
- Janaki Devi Bajaj (1893–1979), Indian independence activist and wife of Jamnalal Bajaj
- Companies
- Bajaj Group, a group of Indian firms in diverse businesses, originally founded by Jamnalal Bajaj
- Bajaj Auto, a manufacturer of two and three wheelers in India, Indonesia and South America, part of the Bajaj group
- Bajaj Tempo, former name of Force Motors, a manufacturer of light trucks in India
- Products
- An auto rickshaw (three-wheeler), generically known as "Bajaj" after the Bajaj Auto company manufacturing such cars
- Daihatsu Midget, a single-seat mini-truck also marketed under the name Bajaj
- Dns Bajaj A graphical tool for checking the delegation of a domain.
- School
- The Jamnalal Bajaj Institute of Management Studies, a Business school in Mumbai, India