Short answer: Allison Shaw was played by Elisabeth Röhm.

Details:

  • Elisabeth Röhm is credited as portraying Allison Shaw on the TV series The Last Ship.
  • The role appears in several episodes across the show's run (credited on cast listings such as IMDb and other episode/cast databases).
  • For a full cast listing and episode credits, see the show's IMDb page.

Bottom note: Information gathered from public forums or data available on the internet and portrayed here.