I have noticed from my site analysis that lots of people are interested in the religion and caste of Anna Hazare. I think this might be just out of curiosity.

Anna Hazare is a Hindu who believes Saint Dnyaneshwar and Swami Vivekananda are his teachers. In fact, he started his social work by reconstructing Saint Yadav Baba temple in Ralegan Siddhi.

I am not sure about his caste, but I think he is from the Maratha caste. Majority of the people in Maharashtra are from the Maratha caste.