Data Systems & Solutions, LLC (DS&S) is a supplier of safety-critical systems and services. The company operates as a subsidiary of Rolls-Royce plc. DS&S principally engages in the development of unique combination of consulting, solutions development, and managing services for worldwide customers across various industries to protect, control and optimize reliability and availability while ensuring safe operations. The company specializes in designing of instrumentation and control products and integrated solutions for both new and refurbished systems of all types and all power levels. In addition, the company manufactures nuclear power safety and non-safety control and monitoring systems. The service line of the company includes data acquisition & management, enterprise asset management and equipment health monitoring. The company has its operations in the US, the UK, France and Czech Republic. It is headquartered at Reston, Virginia, US.

The company transferred its nuclear instrumentation and control activities to its parent company, Rolls-Royce plc. Its assets optimization activities are now known as OSyS, Optimized Systems and Solutions.