Beginning with the 2008 global crisis in the United States, and particularly after the COVID-19 pandemic shook economies around the world, academics, practitioners, and other experts have become increasingly sensitised to the potential for financial and economic fragility to result in a systemic breakdown. Presenting a synopsis of lessons learnt from financial crises arising out of the 19th, 20th and 21st centuries, each entry examines a unique past issue to help to develop future outcomes, operating as a touchstone for further research.