Phosphoramides are a class of phosphorus compounds with the formula O=P(NR<sub>2</sub>)<sub>3-n</sub>(OH)<sub>n</sub>. They can be considered derivatives of phosphoric acid where OH groups have been replaced with an amino or R-substituted amino group. In practise the term is commonly confined to the phosphoric triamides (P(=O)(NR<sub>2</sub>)<sub>3</sub>), essentially phosphoramide and derivatives thereof. Derivatives with the general structures P(=O)(OH)(NR<sub>2</sub>)<sub>2</sub> or P(=O)(OH)<sub>2</sub>(NR<sub>2</sub>) are usually referred to as phosphoramidic acids.