In organophosphorus chemistry, phosphoramidates (sometimes also called amidophosphates) are a class of phosphorus compounds structurally related to phosphates (or organophosphates) via the substitution of an  group for an amine group (). They are derivatives of phosphoramidic acids, which possess the structure  or .
A phosphorodiamidate is a phosphate that has two of its hydroxyl () groups substituted by amine () groups to give a species with the general formula .  The substitution of all three OH groups gives the phosphoric triamides (), which are commonly referred to as phosphoramides.