Intangible capital, a broad category of knowledge-based assets that lack physical embodiment, increasingly shapes the distribution of income in global value chains (GVCs). While some intangible assets are reported in national accounts (e.g. R&D or computer software and databases), others are hard to detect in conventional statistics (e.g. brand value or organisational capital). In this paper, we combine information on factor income from national accounts with the OECD Inter-Country Input-Output tables in order to estimate returns to measured (i.e. included in national accounts) and ‘unmeasured’ intangible capital (captured as a residual) in GVCs. We find that total intangible capital accounts for about 27% of income in manufacturing GVCs and that this share has increased between 2005 and 2015 in OECD countries. The paper highlights differences across GVC stages and specific types of GVCs. A significant share of income is captured at the distribution stage, particularly in buyer-driven value chains. An econometric analysis suggests that trade and investment openness are important determinants of patterns in returns to intangible capital in GVCs. Direct public funding of R&D and the quality of intellectual property protection are associated with higher returns to intangible assets.