The Plutellidae are a small family of about 150 species of moths in the superfamily Yponomeutoidea, with 7 species recorded in the UK and around 22 in Europe. The family was established by Achille Guenée in 1845.

Adults have wingspans of 12–23 mm (forewing length 6–11.5 mm in UK species), with narrow, often pale or greyish wings held roof-like at rest. Most are nocturnal. Larvae are leaf miners or web-formers, feeding mainly on Brassicaceae (e.g., cabbage, mustard), though some use Capparaceae or Tropaeolaceae; early instars mine leaves, later ones fold or roll them.

The family includes the genus Plutella (diamondback moths), with P. xylostella (cosmopolitan pest of crucifers) and P. porrectella (UK native). Rhigognostis species (e.g., R. annulatella) also occur in Europe. Recent studies use DNA barcoding to resolve cryptic species and migration patterns in pest populations.