ELS
ELS or Els may refer to:

Education
Emerson Literary Society, a social society at Hamilton College
Empirical legal studies
English Language School, Dubai
Europeesche Lagere School, a school system in the colonial Dutch East Indies
Expeditionary learning schools, in the United States

Medicine and science
Early Life Stage test, a chronic toxicity test
Eaton–Lambert syndrome, a muscle disease
Editor in the Life Sciences, a professional certification
ELS cotton (Gossypium barbadense), a species of cotton
Encyclopedia of Life Sciences, an online encyclopedia

People
Els (given name), a feminine given name short for Elisabeth
Ernie Els (born 1969), South African golfer
Jurie Els, South African singer

Technology
Electrophoretic light scattering
Engineered Lifting Systems & Equipment, a Canadian manufacturing company
Ensemble de Lancement Soyouz, a launch pad at Guiana Space Centre
Extreme Loading for Structures, structural analysis software
Emergency Light System, emergency lighting installed on emergency vehicles

Other uses
Els (Streu), a river in Germany
East London Airport, in South Africa
Edinburgh Labour Students, a student wing of the Labour Party of the United Kingdom
Equidistant letter sequence, a bible code method
Escanaba and Lake Superior Railroad, in the United States
Evangelical Lutheran Synod, a US-based Protestant Christian denomination
Liberation Army of the South (Spanish: Ejército Libertador del Sur), an armed group active during the Mexican Revolution