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Phosphoric acid on its purest state is an (inorganic) solid, so  viscosity is considered not to be a relevant parameter. Nevertheless as phosphoric acid is produced and handled most of the time as a liquid, available supporting data are provided. They show  viscosities of 5% to 105% aqueous solutions of Phosphoric Acid in the range of 1.1 to 600 mPa.s at 20°C.

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Additional information

Supporting data from six handbooks show increasing vicosity with increasing phosphoric acid concentrations in aqueous solutions. Viscosities range from 1.1 cP (mPa.s) at 5% Phosphoric Acid to 600 cP (mPa.s) at 105% Phosphoric Acid, at 20°C.