- Family: Titan
- Length: 42 m
- Diameter: 3.05 m
- Launch Mass: 161 T
- Low Earth Orbit Capacity: 3100 kg
The Titan IIIA was manufactured by Lockheed Martin with the first launch on 1964-09-01. Titan IIIA has 3 successful launches and 1 failed launches with a total of 4 launches. The Titan IIIA or Titan 3A was an American expendable launch system, launched four times in 1964 and 1965, to test the Transtage upper stage which was intended for use on the larger Titan IIIC. The Transtage was mounted atop two core stages derived from the Titan II. The Titan IIIA was also used as the core of the Titan IIIC.