This question asks us to identify the first Indian writer who authored a novel in English. It's important to distinguish between writing in Indian languages and writing specifically in the English language for the first time by an Indian author.
Bankim Chandra Chatterjee is widely recognized for his significant contributions to Bengali literature and is often credited with writing the first novel in English by an Indian author, or pioneering the genre in India. While he wrote extensively in Bengali, his work often explored themes relevant to the Indian consciousness during the colonial era. His novel Rajmohan's Wife, published in 1864, is considered by many literary historians to be the first Indian novel written in English.
Therefore, based on historical literary assessments, Bankim Chandra Chatterjee holds the distinction of being the first Indian writer to publish a novel in the English language.