- Family: Delta
- Length: 34 m
- Diameter: 2.44 m
- Launch Mass: 116 T
- Low Earth Orbit Capacity: 1300 kg
The Delta 0900 was manufactured by McDonnell Douglas with the first launch on 1972-07-23. Delta 0900 has 2 successful launches and 0 failed launches with a total of 2 launches. The Delta 0100 series, also Delta 100, 0300 or 300 series, was an American expendable launch system which conducted orbital launches between 1968 and 1972. It was a member of the Delta family of rockets, and the first to be designated using a four digit numerical code. Two variants were flown, individually designated Delta 0300 and Delta 0900.