| SBS 4 | |
| Mission Type: | Communications |
| Cospar Id: | 1984-093B |
| Satcat: | 15235 |
| Mission Duration: | 7 years design life |
| Spacecraft Bus: | HS-376 |
| Manufacturer: | Hughes Space and Communications |
| Launch Date: | UTC |
| Launch Rocket: | Space Shuttle Discovery STS-41D |
| Launch Site: | Kennedy LC-39A |
| Launch Contractor: | NASA |
| Disposal Type: | Decommissioned |
| Orbit Epoch: | August 30, 1984 |
| Orbit Reference: | Geocentric |
| Orbit Regime: | Geostationary |
| Orbit Inclination: | 23° |
| Orbit Period: | 640.2 minutes |
| Orbit Eccentricity: | 0.72775 |
| Orbit Longitude: | 94° W |
| Apsis: | gee |
| Trans Band: | 14 Ku band |
SBS 4 was a geostationary communications satellite designed and manufactured by Hughes (now Boeing) on the HS-376 platform. It was ordered by Satellite Business Systems, which later sold it to Hughes Communications. It had a Ku band payload and operated at 94°W longitude.
The spacecraft was designed and manufactured by Hughes on the HS-376 satellite bus. It had a launch mass of 1117kg (2,463lb), a geostationary orbit and a 7-year design life.
On August 30, 1984, SBS 4 was launched by Space Shuttle Discovery in the mission STS-41D from Kennedy Space Center at 12:41:50 UTC. The satellite was launched along with the satellites Telstar 302 and Leasat 2.
On 29 September 2005, SBS 4 was finally decommissioned and put into a graveyard orbit.