A method of producing a hemp protein product having a protein content of at least 60 wt%, preferably at least 90 wt%, (N x 6.25) on a dry weight basis, which comprises: (a) extracting a hemp protein source with an aqueous calcium salt solution, preferably an aqueous calcium chloride solution, having a concentration of 0.15M or less to cause solubilization of hemp protein from the protein source and to form an aqueous hemp protein solution, wherein the solubilization time is between 1 and 60 minutes and wherein extraction is effected at a temperature of 15° to 65°C, (b) at least partially separating the aqueous hemp protein solution from residual hemp protein source wherein said aqueous hemp protein solution has a protein concentration of 5 to 50 g/L, (c) diluting the aqueous hemp protein solution with 0.5 to 2 volumes of aqueous diluent to a conductivity of 21 mS or less, (d) adjusting the pH of the aqueous hemp protein solution to a pH of 1.5 to 4.4 to produce an acidified aqueous hemp protein solution, (e) optionally clarifying the acidified hemp protein solution, (f) alternatively from steps (b) to (e), diluting and then adjusting the pH of the combined aqueous hemp protein solution and residual hemp protein source to a pH of 1.5 to 4.4 then separating the acidified aqueous hemp protein solution from residual hemp protein source, (g) concentrating the aqueous hemp protein solution while maintaining the ionic strength substantially constant by a selective membrane technique with a membrane having a molecular weight cut-off of 1,000 to 100,000 Daltons and at a temperature of 2° to 65°C to produce a concentrated acidified hemp protein solution having a protein concentration of 50 to 300 g/L, (h) diafiltering the concentrated hemp protein solution using 1 to 40 volumes of diafiltration solution wherein the diafiltration solution is water, acidified water, dilute saline or acidified dilute saline on the acidified hemp protein solution before or after partial or complete concentration thereof, and (i) drying the concentrated and diafiltered hemp protein solution. (a) extracting a hemp protein source with an aqueous calcium salt solution, preferably an aqueous calcium chloride solution, having a concentration of 0.15M or less to cause solubilization of hemp protein from the protein source and to form an aqueous hemp protein solution, wherein the solubilization time is between 1 and 60 minutes and wherein extraction is effected at a temperature of 15° to 65°C, (b) at least partially separating the aqueous hemp protein solution from residual hemp protein source wherein said aqueous hemp protein solution has a protein concentration of 5 to 50 g/L, (c) diluting the aqueous hemp protein solution with 0.5 to 2 volumes of aqueous diluent to a conductivity of 21 mS or less, (d) adjusting the pH of the aqueous hemp protein solution to a pH of 1.5 to 4.4 to produce an acidified aqueous hemp protein solution, (e) optionally clarifying the acidified hemp protein solution, (f) alternatively from steps (b) to (e), diluting and then adjusting the pH of the combined aqueous hemp protein solution and residual hemp protein source to a pH of 1.5 to 4.4 then separating the acidified aqueous hemp protein solution from residual hemp protein source, (g) concentrating the aqueous hemp protein solution while maintaining the ionic strength substantially constant by a selective membrane technique with a membrane having a molecular weight cut-off of 1,000 to 100,000 Daltons and at a temperature of 2° to 65°C to produce a concentrated acidified hemp protein solution having a protein concentration of 50 to 300 g/L, (h) diafiltering the concentrated hemp protein solution using 1 to 40 volumes of diafiltration solution wherein the diafiltration solution is water, acidified water, dilute saline or acidified dilute saline on the acidified hemp protein solution before or after partial or complete concentration thereof, and (i) drying the concentrated and diafiltered hemp protein solution.