Indra Sistemas, S.A. (Spanish pronunciation: [ˈindɾa sisˈtemas]) is a Spanish information technology and defense systems company. Indra is listed on the Bolsa de Madrid and is a constituent of the IBEX 35 index.

Indra is organized around three business areas: information technologies, simulation & automatic test equipment, and defense electronic equipment.

Indra's portfolio ranges from consultancy, project development, and systems and applications integration to outsourcing of IT systems and business processes. This offer is structured into two primary segments: solutions and services.

Indra claims to focus on systems and solutions (including outsourcing and application maintenance), and business processes where technology is a strategic and differentiating element (BPO).

Approximately a third of the company's annual revenues come from international markets. By geographical areas, Europe and the United States are the two international markets with the greatest weight and growth for Indra. Latin America is also a geographical area in which Indra is operating.

The following are among Indra's main business areas:

Air traffic control systems – where it is one of the world's largest suppliers;[3] Indra claims that a third of the world's air traffic is managed by systems developed by the company
Ticketing systems developed for underground railway systems – such as those in Madrid, Barcelona, Paris, Lisbon, Shanghai, Athens, Buenos Aires and Santiago de Chile
Financial services
Energy
Electoral technology and processes
Aircraft simulators
Defense
Health information systems