- lallans
- lakshmī: —the goddess of wealth
- lally column
- lalorrhoea
- ladylove
- laevorotation
- laffite
- laffer
- laevorotatory
- lafitte
- lag b'omer
- lagarostrobus franklinii
- lagend
- lagidium
- lagoon
- lagopus scoticus
- lagostomus
- laguna
- lynx rufus
- lyonia
- lyonnais
- lyrical
- lyrical poetry
- lysenko
- lysergic acid
- lysichiton americanum
- lysichitum
- lysiloma
- laboratory bench
- laid back
- lake aral
- lake cayuga
- lake champlain
- lake edward
- lake erie
- lake huron
- lake ladoga
- lake okeechobee
- lake trout
- lake vanern
- lake whitefish
- lakh
- lally
- lag bolt
- lag screw
- lagan
- liam o'flaherty
- level
- lubber
- labiatae