Knautia is a genus in the family Dipsacaceae. The common names of these flowers are a variant of "widow flower." Others are given the name "Scabious," although this word belongs to a related genus (Scabiosa).

Species include:

• Knautia arvensis - Meadow Widow Flower, Blue Buttons, Field Scabious
• Knautia carinthiaca
• Knautia drymeia - Hungarian Widow Flower
• Knautia kitaiebellii
• Knautia longifolia - Long Leaf Widow Flower
• Knautia Macedonica
• Knautia maxima - Forest Widow Flower
• Knautia norica

The genus Knautia comes from the 17th century German botanist, Dr Knaut.