IFAS

IFAS may refer:


 * Institute of Food and Agricultural Sciences at University of Florida
 * Integrated Fixed-Film Activated Sludge, a sewage treatment process
 * International French adjectival system, a grading system used in mountaineering
 * Irish Federation of Astronomical Societies
 * Institute for Advanced Studies, an education organization
 * Indian Frontier Administrative Service, created in 1954 and merged into Indian Administrative Service in 1968, see