This document summarizes 100 impact case studies that demonstrate the benefits of research funded by the UK's National Institute for Health Research (NIHR) over its first 10 years. It is organized into 10 thematic sections. The case studies show how NIHR-funded research has: 1) brought medical advances to patients through new treatments and technologies; 2) supported world-leading research with global impact; and 3) helped make the UK's health and care system more effective. The full report provides more detailed write-ups of each case study.