This is a list of characters in Sea Patrol, an Australian TV series.

Lieutenant Commander Mike Flynn -- ("CO") -- is the Hammersley's Commanding Officer ("CO"), and one of the two principal characters of the series, present from beginning to end. Played by Ian Stenlake.

Lieutenant Kate McGregor -- ("XO") -- is the Hammersley's Executive Officer ("XO") (second-in-command), and one of the two principal characters of the series, present from beginning to end. Played by Lisa McCune.

Andrew "Andy" Thorpe
Sea Patrol character
First appearance	Welcome Aboard Ep. 1.01 (Pilot), aired 5 July 2007
Portrayed by	John Batchelor (Australian actor)
In-universe information
Nickname	Charge or Charge-o
Gender	Male
Spouse	Helen (Divorced about 10 years ago)
Children	2, boy (Jamie) and girl (Jessica)
Rank	Chief Petty Officer
Position	Chief engineer

Chief Petty Officer Andrew "Charge" Thorpe MBA is a fictional TV character on the show Sea Patrol. He is portrayed by John Batchelor. On HMAS Hammersley, Charge is the chief engineer. Swain tells us that Charge is a 41-year-old male in the episode "Dogs of war".^[1] He has a son, named Jamie, who is a midshipman in the navy. His awards in order of precedence are as follows:

He ultimately leaves the navy and becomes a mining engineer in Western Australia

Petty Officer Chris Blake -- ("Swain") -- is the ship's coxswain/medic, and often the softening influence on various situations, and is present throughout the entire series. Played by Matt Holmes.

Robert Dixon jr
Sea Patrol character
First appearance	Welcome Aboard Ep. 1.01 (Pilot), aired 5 July 2007
Portrayed by	Kristian Schmid
In-universe information
Nickname	RO
Gender	Male
Family	Father (deceased)
Rank	Leading Seaman
Position	Radio Operator

Leading Seaman Robert Dixon is a fictional TV character on the show Sea Patrol. He is portrayed by Kristian Schmid. Robert Dixon (also RO) is the radio operator on board HMAS Hammersley. RO usually makes pessimistic predictions about the events that take place in and around the Hammersley. He is known for his vast knowledge on foreign languages, his strange ability to keep calm and a straight-face at all times and his annoyance at almost everybody. His awards in order of precedence are as follows:

Jessica "Bird" Bird
Sea Patrol character
First appearance	"Night of the Long Knives" Ep. 4.01, aired 15 April 2010
Portrayed by	Danielle Horvat
In-universe information
Nickname	"Bird"
Gender	Female
Rank	Seaman
Position	Gap Recruit (General Experience), later Chef/Assistant Medic

Jessica 'Gap Girl' Bird is a fictional television character portrayed by Danielle Horvat. She replaced Billy "Spider" Webb doing his Boatswain's Mate duties onboard HMAS Hammersley while doing her Gap Year in the RAN. Her first appearance was the first episode of Season 4. Jessica Bird is a young Navy sailor on HMAS Hammersley, after finishing high school she decided to sign up for a gap year on Navy patrol boat. Dutchy and the crew keep her under their wings. Bird is a favourite of the crew on whom to play pranks – particularly by 2Dads (Kosov-Meyer).^[2] In series five, Bird becomes Hammersley's chef after Bomber leaves Hammersley after her affair with 2Dads.

Commander Maxine "Knocker" White, played by Tammy MacIntosh in Series 4 and 5, is the shore-based Squadron Commander, over HMAS and some other patrol craft in her area of command. She is the immediate superior to HMAS Hammersley's Commanding Officer ("CO") Mike Flynn—and had a brief affair with him early in their careers. Later it is revealed that Mike is the father of her son Ryan, not her ex-husband, Stewart White. She and Mike briefly rekindle their relationship in season 5, but it does not last long.

Midshipman Ryan White, a naval cadet, played by Dominic Deutscher, takes his orientation cruise aboard HMAS Hammersley—apparently by the arrangement of his mother, the Hammersley's Squadron Commander, Commander Maxine 'Knocker' White, who has a past with the CO. Ryan is apparently her son by her ex-husband (Stewart White), the relationship between Ryan and CO Flynn grows increasingly complex and serious as the final season progresses, and ends dramatically. Along the way, Ryan's adventures and crew relations are complicated by his semi-official standing as crew, by his internal coming-of-age crises, and his past, particularly by his relationship to the boatswain/chef, Jessica 'Gap Girl' Bird, with whom he was attempting to pursue for a relationship before his assignment to Hammersley.

• Nikki "Nav" Caetano
  Main article: Nikki Caetano
• Pete "Buffer" Tomaszewski
• Josh "ET" Holiday
• Billy "Spider" Webb
• Toby "Chefo" Jones