Carlos Jaschek (March 2, 1926 – April 12, 1999) was a German-born Argentine astrophysicist who spent time in the United States, lived in Switzerland, settled in France, became a French citizen and worked to make astronomical data accessible to all nations. As the second Director of a new center in Strasbourg, France, designed to be a computerized repository for data about the stars, he was part of its early team who were determined, clearsighted decision-makers when its resources were limited.
Jaschek began in astronomy at La Plata, in South America, later directing its Astrophysics Department. He travelled and conducted research at many observatories along with his wife, the stellar astronomer and spectroscopist Mercedes Jaschek, with whom he spent a lifetime collaborating in research. They lived in Argentina from 1937 to 1973. With his wife and his other colleagues, Jaschek was involved with both stellar spectroscopy and photometry, the newly-accessible infrared(IR) and ultraviolet (UV) as well as visible light,  astronomical statistics and guidelines for designating stars, and with the chemically peculiar stars
In addition to his research discoveries, he co-created atlases and catalogues and published them. He was President of the International Astronomical Union's Commission 45 Stellar Classification. and was an early proponent of creating astronomical databases.
He founded an organization to encourage research on the impact of astronomy on society, the SEAC. The Jaschek's retired in 1993 and moved to Spain, continuing to be active in scientific endeavors. Mercedes Jaschek died in 1995, and Carlos Jaschek in 1999.