Aban Offshore (formerly Aban Loyd Chiles Offshore Ltd.) (BSE: 523204), (NSE: ABAN) is Indian multinational offshore drilling services provider headquartered in Chennai, India. Its services are mainly used by oil companies, especially for ONGC. It is now ventured into international waters as one of its five rigs is doing work for an Iranian oil company. The company listed on the Bombay Stock Exchange Ltd.