Lambda

;Astronomical nomenclature
* Lambda Coronae Borealis, a star system
* Lambda Geminorum, a star
* Lambda Paz, a moon
* Lambda Sagittarii, a star system
;Classifications
* Janeway Lambda One, a holodeck program
* "Janeway-lambda-3", a security code
* Lambda (classification), a classification in the mirror universe
* Lambda sequence, evasive maneuver used by Kathryn Janeway against the Kazon
* "Tuvok-1-4-9-4-lambda", a security clearance code
;Physics
* Lambda field generator, a generator that produced a lambda field
fr:Lambda