This chapter considers the markets for the trading of derivatives and commodities in the UK, which form an important part of the financial services industry of the City of London. This chapter describes the precursors of the types of trading activities that were conducted historically in the City of London and have spread to neighbouring areas of west, central, and east London for the past forty years. It also emphasizes the growth of electronic trading platforms and the rapid growth of technology that diffuses trading activities geographically. This chapter addresses the question as to whether it makes sense to continuously speak of “UK” derivatives and commodities markets, as opposed to European or international markets. It talks about over—the—counter (OTC) trades executed in the UK that often involve at least one party operating from a location outside the UK.