Hinduism is a minor religion in Bulgaria. Hinduism spread to Bulgaria by ISKCON. ISKCON started spreading Krishna Consciousness to Bulgarians from 1996.
Hinduism in Bulgaria Wikipedia
There are 137 Indians that live and work in Bulgaria. There are no Hindu temples in Bulgaria. 
Centre 1- Sofia, Bulgaria, 4 Joliot Curie, entrance from the South, Back Home Vedic Cuisine
Centre 2- Sofia, Bulgaria, 119 St. Kliment Ohridski Boulevard, Sri Sri Gaura Nitai Mandir
The first Rathayatra parade in Bulgaria was organized in 1996. Till March 2008, twelve Rathayatra festivals were celebrated in Bulgaria. The Bulgarian Rathayatra festival was the first in the Balkans.
Rathayatra is one of the Major Vaishnava Festival celebrated by Krishna’s devotees in Bulgaria, and it is attended even by devotees from neighboring Macedonia and Serbia.
Yoga is gaining popularity in Bulgaria.
One such is Sahaja Yoga, a method of meditation which seeks to bring human awareness. It was created by Shri Mataji Nirmala Devi in 1970.