Bajaj is a surname. Notable people with the surname include:

• Aarti Bajaj, Indian film editor
• Jamnalal Bajaj (1884–1942), Indian businessman, founder of the Bajaj group of companies
• Rahul Bajaj (born 1938), 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

• Rhys Petrelli
• Rhys Philip Elliot Murphy
• Rhys Phillips
• Rhys Pickering
• Rhys Powell
• Rhys Richards
• Rhyssella
• Rhyssella humida
• Rhyssella nitida
• Rhyssemus
• Rhyssemus germanus
• Rhyssemus scaber
• Rhyssemus sonatus
• Rhyssinae
• Rhys (singer)
• Rhys Smith
• Rhyssoleptoneta
• Rhyssoleptoneta latitarsa
• Rhyssomatus
• Rhyssomatus aequalis
• Rhyssomatus annectens
• Rhyssomatus fissilis
• Rhyssomatus medialis
• Rhyssomatus ovalis
• Rhyssomatus palmacollis