The 11-volume work covers Hindu spiritual beliefs, practices and philosophy, and is the culmination of a 25-year academic effort.
The encyclopedia is written in English and includes about 7,000 articles on Hinduism and its practices. The work also deals with Indian history, languages, art, music, dance, architecture, medicine, and women's issues.
The entire encyclopedia contains more than 1,000 illustrations and photographs. Brightly coloured images of Hinduism's deities fill entire pages, with foot-noted explanations of the forms and powers God can take in the religion.
"This hadn't really been attempted before," said French, 83, a distinguished professor emeritus of religious studies at the school and an associate editor. "It is a milestone of research that brought together both Eastern and Western scholarship."
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French, who specialises in the religions of Asia and served as an associate editor of the encyclopedia, said a primary inspiration for the work is one of India's most revered spiritual leaders, Swami Chidanand Saraswati, who is coming to the USC conference that will celebrate the work's launch.
The encyclopedia's volumes run from 600 to more than 700 pages. Some 3,000 copies are being issued in the first printing and will be of interest to libraries, religious institutions, and those studying Indian culture around the world, French said.
Hinduism is the world's third-largest religion, with 1 billion followers, according to a Pew Research Center study published this year. Christians number 2.2 billion and Muslims 1.6 billion, the study showed.
Many Hindus who settled around the world have found that they need a comprehensive source of information on the religion for their children, said Sadhvi Bhagawati Saraswati, managing editor of the encyclopedia and a secretary of the India Heritage Research Foundation.
"They wanted a source to go to so they could pass the correct information to their children," she said. She explained that the encyclopedia project took more than 20 years because "it began in pre-computer days.