|Names||HellasSat 4, SaudiGeoSat 1, SaudiGeostationarySatellite 1, SGS-1/HS-4|
|Operator||KACST, Hellas Sat|
|Mission duration||15 years (planned)|
|Launch mass||6495 kg|
|Start of mission|
|Launch date||5 February 2019|
|Rocket||Ariane flight VA247|
|Launch site||Centre Spatial Guyanais, ELA-3|
|Reference system||Geocentric orbit|
SaudiGeoSat 1/HellasSat 4, also known as SaudiGeoSat 1/HellasSat 4 (abbreviated SGS-1/HS-4), is a Saudi and Greek geostationary communication satellite of King Abdulaziz City for Science and Technology (KACST) and HellasSat. It was built by Lockheed Martin and was launched on 5 February 2019 on board Ariane flight VA247.
The satellite will provide Telecommunications capabilities, including television, Internet, telephone and secure communications in the Middle East, South Africa and Europe. It is the 16th Saudi satellite launched into space and the 4th Greek and Cypriot satellite.