Tris(hydroxymethyl)phosphine is the organophosphorus compound with the formula P(CH2OH)3.

The compound is multifunctional, consisting of three alcohol functional groups and a tertiary phosphine.

It is prepared by treating tetrakis(hydroxymethyl)phosphonium chloride with strong base:[2][3] The compound can be prepared on a large scale using triethylamine as base and as solvent.

[4] The compound forms complexes with a variety of metals.

[4] The compound decomposes violently to phosphine and formaldehyde upon attempted distillation.