FLS

Fellow of the Linnean Society of London
FLS Industries, a Danish-owned, worldwide engineering conglomerate
Fordham Law School in New York City
Free List Suspended, a term used in cinemas to indicate that free tickets are not accepted at a particular performance. This usually applies during the first fortnight after the release of a new film and is imposed on the cinema by the film's distributor.
Front Line States, an organization established to achieve black majority rule in South Africa
Fruity Loops Studio, a suite of music-production software
Fatigue Limit State, an ultimate limit state condition accounting for accumulated cyclic load effects
Flowserve, a world supplier of pumps, valves, seals automation and services to the power, oil, gas, chemical and other industries
The IATA airport code for Flinders Island Airport
First Level Support, a term for the initial assistance provided by a help desk or call center
FLSmidth, Producer of equipment, systems and services for the cement and minerals industries
Flying Lab Software, a video game developer