A process for the production of a protein isolate from an oilseed meal. The process comprises: (i) Mixing the oilseed meal with a solvent； (ii) Separating the fibre in the mixture from the protein slurry containing the soluble and insoluble protein fractions； (iii) Separating the protein slurry into the protein solids and soluble protein fractions； (iv) Mixing the protein solids with a solvent to form a second protein slurry； (v) Separating the second protein slurry into the protein solids and soluble protein fractions； (vi) Separating the soluble protein fraction into a clarified soluble protein and residual insoluble protein fractions； and (vii) Separating the clarified soluble protein fraction by filtering to remove any residual insoluble protein. The oilseed protein isolate has the following molecular weight ratios: (i) 60 to 90 percent (w/w) between 60 to 80 kDa； (ii) 10 to 30 percent (w/w) between 10 to 30 kDa； and (iii) 2 to 10 percent less than 10 kDa. The oilseed can be a canola seed.
