This paper documents the downward trend in the labor share of global income since the early 1990s, as well as its heterogeneous evolution across countries, industries and worker skill groups, using a newly assembled dataset, and analyzes the drivers behind it. Technological progress, along with varying exposure to routine occupations, explains about half the overall decline in advanced economies, with a larger negative impact on middle-skilled workers. In emerging markets, the labor share evolution is explained predominantly by global integration, particularly the expansion of global value chains that contributed to raising the overall capital intensity in production.