Lotus glaber (Narrow-leaf Bird's-foot Trefoil) is a flowering plant of the pea family Fabaceae, native to western and southern Europe and southwest Asia. Some botanists treat it as a subspecies of Lotus corniculatus, as L. corniculatus subsp. tenuifolius.
Its tolerance of salt and poor soil make this plant useful for marginal conditions. It has become naturalised in many other locations, including the Pampas of Argentina, and parts of the United States.
It is also called Slender Trefoil, Creeping Trefoil, or Prostrate Trefoil.