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Quarterdeck Office Systems, later Quarterdeck Corporation, was an American computer software company. It was founded by Therese Myers and Gary Pope in 1981 and incorporated in 1982. Their offices were initially located at 150 Pico Boulevard in Santa Monica, California and later at 13160 Mindanao Way in Marina Del Rey, California. In the 1990s they had a European office in Dublin, Ireland. Their most famous products were the Quarterdeck Expanded Memory Manager, DESQview, CleanSweep, DESQview/X, Turboload, Quarterdeck Mosaic, and Manifest.
In 1997, Quarterdeck acquired Datastorm Technologies Inc., publishers of ProComm, and relocated its technical support and development operations to Datastorm's Columbia, Missouri headquarters.
In 1998, after the market for DOS utilities collapsed, Quarterdeck was acquired by Symantec (the Norton Utilities company). Symantec discontinued support of certain Quarterdeck products (eg. Mosaic), or integrated them into larger offerings (eg. CleanSweep became part of Norton SystemWorks).