Siemens IT Solutions and Services is a service provider which is currently owned by Atos (formerly Siemens). Siemens IT Solutions and Services provides a wide range of information technology services such as consulting, systems integration, and IT management.

Siemens IT Solutions and Services was formed on 1 October 2007, when several groups from various countries were merged to form a single division.

SIS became an entity legally independent of Siemens AG in October 2010.

In December 2010, it was announced that Atos Origin would form a strategic partnership with Siemens AG. The deal concluded in July 2011, where Siemens contributed its Siemens IT Solutions and Services for a total sum of €850 million to Atos Origin in order to create a European IT branch. Siemens will for a period of at least five years be a shareholder of Atos Origin with a 15% stake. As part of the transaction, Siemens concluded a seven-year outsourcing contract worth around €5.5 billion, under which Atos Origin will provide Managed Services and Systems Integration to Siemens. As part of the merger, Atos Origin changed its name to "Atos".

Siemens AG (German pronunciation: [ˈziːməns]) is a German multinational conglomerate company headquartered in Munich, Germany. It is the largest Europe-based electronics and electrical engineering company.

Siemens is an integrated technology company with activities in the fields of industry, energy and healthcare. It is organised into six main divisions: Industry, Energy, Healthcare, Equity Investments, Siemens IT Solutions, and Services and Siemens Financial Services (SFS).

Siemens and its subsidiaries employ approximately 360,000 people across nearly 190 countries and reported global revenue of approx 71 billion euros for the year of 2011. Siemens AG is listed on the Frankfurt Stock Exchange, and has been listed on the New York Stock Exchange since March 12, 2001.

Siemens & Halske was founded by Werner von Siemens on 12 October 1847. Based on the telegraph, his invention used a needle to point to the sequence of letters, instead of using Morse code. The company, then called Telegraphen-Bauanstalt von Siemens & Halske, opened its first workshop on October 12.