Tieto Oyj (until April 2009 TietoEnator) is an IT software and service company providing IT and product engineering services. Active in more than 20 countries with approximately 14,000 employees, Tieto is one of the largest IT service providers in Europe. Tieto is domiciled in Helsinki, Finland, and the company's shares are listed on the NASDAQ OMX Helsinki and Stockholm.

The company provides services to the following industry groups: financial services, public, healthcare & welfare, industrial and consumer services. Service lines are technology services and modernization, industry solutions including data-driven businesses organized independently of other businesses; Business Consulting and Implementation; Product Development Services.