Oaths Act Obstructions in Fairways Act Official Languages Act Official Secrets Act Official Trustees Act Offshore Areas Minerals (Development and Regulation) Act, 2002 Oil and Natural Gas Commission (Transfer of Undertaking and Repeal) Act Oil Fields (Regulation and Development) Act Oil Industry (Development) Act Opium and Revenue Laws (Extension of Application) Act Oriental Gas Company Oriental Gas Company Orissa Weights and Measures (Delhi Repeal) Act Orphanages and Other Charitable Homes (Supervision and Control) Act Oudh Estates Act Oudh Laws Act Oudh Sub-settlement Act Oudh Taluqdars' Relief Act Oudh Wasikas Act