Logica plc was a multinational IT and management consultancy company headquartered in London and later Reading, United Kingdom.

Founded in 1969, the company had offices in London and in a number of major cities across England, Wales and Scotland, as well as in other countries around the world. It was responsible for many telecommunications infrastructure projects, such as the design of the SWIFT network for international money transfers, the Euronet packet-switching network, and the Bay Area Rapid Transit in San Francisco. Following the acquisition of CMG in 2002, the company was known as LogicaCMG from then until 2008, when it changed its name back to Logica. The company's main business at that point was in providing consulting, systems integration, and IT outsourcing in both the public and private sectors.

Logica was acquired by Canada-based CGI Group in 2012 and the Logica brand name ceased being used in 2013.