Potassium dithioferrate is the inorganic compound with the formula KFeS2.

Regarding its chemical structure, the compound consists of infinite chains of edge-shared anionic FeS4 tetrahedra.

[1] A related family of one-dimensional materials with the formula MFe2S3 (M = K, Rb, Cs).

[2] The compound is prepared by heating iron powder, sulfur, and potassium carbonate at 900 °C.

According to the idealized stoichiometry, this reaction is proposed to cogenerate potassium sulfate:[3]