OLS
The abbreviation OLS stands for:
- the UN mission Operation Lifeline Sudan
 - ordinary least squares ( English for ordinary least squares method ), see least squares method
 - the football league south and other sports
 - Oberlandstrasse , a planned main road in the Canton of Thurgau , Switzerland
 - The OpenGIS Location Service , also OpenLS called
 - the Ottawa Linux Summit in Canada, see Linuxtag
 - the IATA code of Olsobip in Papua New Guinea
 - Optical Landing System , an optical landing system used in aviation
 - the Optiliga on the Schlei
 - the Finnish sports club Oulun Luistinseura
 - Sol Líneas Aéreas , an Argentine airline (ICAO code)
 - Upper airway syndrome, also known as brachycephalic syndrome , see brachycephaly
 
Ols stands for:
- a Danish form of the name of Olaf
 - Ols-et-Rinhodes , a French commune
 - the Piedmontese and Occitan name of the municipality of Oulx in the province of Turin, Italy