The 2019 edition of the International Handbook of Evaluated Reactor Physics Benchmark Experiments contains data from 166 experimental series that were performed at 56 nuclear facilities. A total of 162 of the 166 evaluations are published as approved benchmarks. The remaining four evaluations are published as draft documents only. The information and data included in this handbook are available to NEA member countries, to all contributing countries and to others on a case-by-case basis. Example calculations are presented; however, these do not constitute validation or endorsement of the codes or cross-section data.