Tordylium is a genus of flowering plants in the carrot family (Apiaceae).

The flowers have persistent sepals and white petals, with those on one side much longer than the other.

[5] As of December 2022[update], Plants of the World Online accepted 20 species: Tordylium apulum, the Mediterranean hartwort or Roman pimpernel, is used as a vegetable in Greece and as a flavouring in Italy.

[6] Tordylium officinale, the Officinal or Cretan hartwort (also a Mediterranean species), bears fruit formerly used as an emmenagogue, and the plant (plant part unspecified) has formed one of the ingredients of Theriac, a preparation believed to be an antidote to snake and other venoms.

[7] The genus name derives from the Greek τορδύλιον tordylion, a variant form of τόρδυλον tordylon "hartwort, Tordylium officinale".