Udyog Aadhar is a twelve digit Unique Identification Number provided by the Ministry of Micro, Small and Medium Enterprises, Government of India for small and medium enterprises in India. It is also known as Aadhar for Business. As of July 2018, more than 48 lakh MSMEs in India are registered under Udyog Aadhaar.

Udyog Aadhar scheme was launched in September 2015 by Ministry of Micro, Small and Medium Enterprises under Micro, Small and Medium Enterprises Development Act, 2006 (MSMED Act, 2006) with the purpose to promote micro, small and medium enterprises. The registration of Udyog Aadhar is free.