Disease-free survival, in medicine, a measure of the efficacy of treatment of e.g. cancer

Dell Financial Services

Disc Filing System, a filesystem developed by Acorn Computers

Design for service, a type of 'Design for X', an engineering methodology

Depth-first search algorithm, a part of graph theory

Deutsche Forschungsanstalt für Segelflug (German Research Institute for Sailplane Flight), developers of the "DFS brake" for gliders.

Duty free shop

DFS (retailer): A Hong Kong based retailer (part of LVMH) operating duty-free shops around the Pacific rim

dfs (retailer): a British furniture retailer.

Dynamic Frequency Selection: part of the IEEE 802.11h wireless standard

DCE Distributed File System (DCE/DFS)

Distributed File System (Microsoft)

Dynamic frequency scaling, a method for reducing a microprocessor's power consumption

Deutsche Flugsicherung, The German air traffic control organisation

Discover Financial Services, which offers the Discover Card

Dancer Fitzgerald Sample, a defunct advertising agency, now known as Saatchi & Saatchi.