Lei or Leis may refer to:
- Lei, the plural form of Leu, the name of two currencies. See Romanian leu and Moldovan leu
- Lei (garland), a Hawaiian flower necklace
- Lei (surname), a Chinese name
- Lei, Italy, a town in Sardinia
- Lei Clijsters, a Belgian professional footballer
- Lei Fang, a character in the Dead or Alive game series
- Lei Wulong, a character in the Tekken game series
- l.e.i. (clothing company) a clothing company targeted at teenage girls
LEI may refer to:
- Legal Entity Identification for Financial Contracts, LEI - an identification system to track all parties involved in a financial security transaction including: buyer, seller and issuing (or underlying) companies.
- LEI, the ATA Airport Code for AlmerÃa International Airport
- Leicestershire, county in central England
- Leicester railway station, England; National Rail station code LEI
- Index of Leading Economic Indicators
- LEI Wageningen UR a Dutch research institute
- Lotus Enterprise Integrator, a Lotus Domino software application
LEIS may refer to:
- low-energy ion scattering