This Practice Note provides guidance to offshore oil and gas industry participants who seek to rely on force majeure or frustration relief in relation to their offshore oil and gas drilling, decommissioning and service contracts, as a result of a significant market disruption, such as coronavirus (COVID-19). It provides an overview of force majeure and frustration under English law, includes practical considerations and steps in relation to claiming such relief, and analyses the application of relevant provisions in a sample of commonly used industry contracts. While this note focuses on COVID-19 as the context for the market disruption, the issues it addresses will be applicable to other disruptions affecting the offshore energy sector in the future, including possible future pandemics.