The Steve Irwin
- Length: 53 meters
- Date Built: 1975
- Max Speed: 16 knots
- Country of Origin: Scotland, UK
- Former Name: Westra
- Former Job: Scottish Fisheries Protection Agency vessel
- Most Interesting Fact: The Scottish Fisheries Protection Agency used the Westra to intercept and arrest poachers, as well as monitor compliance of the fisheries industry with Scottish and European Union law
- First Sea Shepherd Expedition: December of 2007, Antarctic Whale Defence Campaign, Operation Migaloo
- Original SSCS Name: The Robert Hunter in memory of Captain Paul Watson’s friend and Greenpeace co-founder Bob Hunter
- Current Name: In honour of the late Australian conservationist Steve Irwin
- Next Mission: Operation Relentless – Captain Sid Chakravarty
The Bob Barker
- Length: 52.2 meters
- Date Built: 1950
- Country of Origin: Norway
- Former Job: Whaling harpoon vessel until 1962
- Most Interesting Fact: After retiring as a whaling ship in 1962, the vessel operated as a submarine seeker for the Norwegian Coast Guard, a fuel resupply vessel, and conducted paid Arctic wildlife tours
- Former Name: Polaris
- Current Name: The Bob Barker – in honour of its benefactor – American television personality, icon, and animal advocate Bob Barker
- First Sea Shepherd Expedition: Departed December 18, 2009, from Mauritius, Africa, to defend the Antarctic Whale Sanctuary on Operation Waltzing Matilda
- Next Mission: Operation Relentless – Captain Peter Hammarstedt
The Sam Simon
- Length: 56 meters
- Date Built: 1993, Tokyo IHI Shipyard
- Max Speed: 16 knots
- Country of Origin: Japan
- Most Interesting Fact: It was once a part of the Japanese whaling fleet
- Former Job: Meteorological Observation Ship for Japan Government
- Former Name: Seifu Maru
- Current Name: Sam Simon - in honour of the co-creator and executive producer of “The Simpsons,” a member of Sea Shepherd’s Board of Advisors, and longtime champion of animals
- First Sea Shepherd Expedition: November 2012, Antarctic Whale Defence Campaign, Operation Zero Tolerance
- Next Mission: Operation Relentless - Captain Adam Meyerson
* Specs are not indicative of recent upgrades