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We discuss diffusion (including sedimentation) and thermal diffusion in the critical region (both for liquid‐liquid and vapour‐liquid equilibria) of binary fluid systems. In particular, we present diagrams and discussions of experimental values of diffusion coefficients, sedimentation coefficients, and thermal diffusion factors for the liquid systems n‐hexane + nitrobenzene (with upper consolute point) and water + triethylamine (with lower consolute point), both at 1 bar, and for the fluid system methane + propane at about 73°C in the critical vaporization region. In the last case, we check a formula proposed by the author in 1950.

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