Conventional sources of micro- and/or small-sized finance include financial intermediaries (banks and financial institutions), personal networks (family, friends, local moneylenders, pawnbrokers), and microfinance institutions. In recent years, online peer-to-peer lending has emerged as a financing scheme, leveraging technology to match borrowers and lenders via the Internet. While online peer-to-peer lending in Vietnam offers potential benefits such as lower transaction costs, broader credit access, and increased lender participation, it also introduces significant risks, particularly for lenders. This book explores various approaches to managing the risks borne by peer-to-peer lenders, comparing Vietnam’s regulatory and risk management strategies with those of the United States and Japan. Ultimately, it proposes a more practical and effective risk diversification framework to support the sustainable development of Vietnam’s peer-to-peer lending sector.