Sergeant

Sergeant is a military or police rank, generally associated with people who weren't commissioned officers. Commonly, sergeants are used as the immediate supervisors of the essentially unranked soldier or policeman. This fact is made particularly clear in UNIT stories, as when John Benton is shown leading ordinary privates in DW: The Mind of Evil, or when the issue of rank plays an important subtextual role, like in MA: The Eye of the Giant.

Sergeant can also be an ordinary name, though such instances are uncommon and even rare in Doctor Who history.

Named

 * Abeland, a police officer from the village of Farringham in NA: Human Nature
 * Baker (The Banquo Legacy), a police officer from the village of Three Sisters
 * Bradshaw (The Crimes of Thomas Brewster), a sergeant who worked under Detective Inspector Patricia Menzies (BFA: The Crimes of Thomas Brewster)
 * Andy Davidson, a former co-worker of Gwen Cooper, whose promotion to police sergeant may have had something to do with his part in Children of Earth (TWN: Long Time Dead)
 * Cormac, a Glaswegian police sergeant who liased with Jack Harkness, when Torchwood Two called the latter to Scotland (TM: Captain Jack and the Selkie)
 * Dennison, from Planet of the Dead
 * Ian Jenner, a Metropolitan Police Service sergeant who was on the trail of Christina de Souza. (DW: Planet of the Dead)
 * Kyle (The Talons of Weng-Chiang), from The Talons of Weng-Chiang
 * Lange, a Metropolitan Police sergeant known to Sgt Quick (JAL: The Similarity Engine)
 * Markham, an Edwardian police sergeant in DW: Black Orchid
 * Harry Pike, a London police sergeant in the mid-21st century, who was the father of Darius Pike, an ally of K9 Mark 2 (K9TV: The Last Precinct)
 * Price (World War Three), who was in charge of security at 10 Downing Street during the Slitheen family takeover of the British government (DW: World War Three)
 * Quick, a sergeant who was friendly with George Litefoot and Henry Gordon Jago (JAL: all series)
 * Vince Wilson, a police officer in Moreton Harwood who briefly met Sarah Jane Smith. (KAC: A Girl's Best Friend)

Unnamed

 * Desk Sergeant from DW: Blink
 * Custody Sergeant from TW: Small Worlds
 * Station Sergeant, from DW: "The Feast of Steven"

Unnamed

 * Duty Sergeant, who imprisoned Jack Harkness. (TW: Children of Earth: Day Five
 * Sergeant (The War Machines) from DW: The War Machines

Named

 * Sandra Applegate, a sergeant stationed at Caregan barracks at the time of a Torchwood Three investigation of the Cowbridge training camp (TWN: Another Life)
 * Arnold (The Web of Fear), a staff sergeant in the regular British Army unit that pre-dated UNIT
 * Bee (Another Life), a British Army soldier stationed at Cowbridge who mysteriously went rogue and committed several murders, forcing Torchwood Three to investigate (TWN: Another Life)
 * Duffy, a British Army sergeant who ran the detention centre that briefly incarcerated the Third Doctor and Sarah Jane Smith in Invasion of the Dinosaurs
 * Johnson, a British Army sergeant who initially tried to keep Gwen Cooper away from a meteorite impact site (TW: Day One)
 * Leigh, a World War II British sergeant who served under Commandr Millington at Maiden's Point (DW: The Curse of Fenric)
 * Peters (The Invasion), a regular army sergeant who served under Major Branwell and briefly took the commands of Zoe Heriot during the events of DW: The Invasion
 * Rilke, an 18th century red coat (BFA: City of Spires)
 * Mike Smith, a Royal Air Force sergeant who was a member of The Association, and once had a fleeting relationship with Ace (DW: Remembrance of the Daleks)
 * Willis (The War Games), a World War I sergeant caught up in the War Lord's War Games (DW: The War Games)
 * Wood (No Man's Land), a British Army sergeant from World War I who once tortured Hex. (BFA: No Man's Land)

Unnamed

 * American Sergeant, from DW: The Tenth Planet
 * Sergeant (The Reign of Terror), from The Reign of Terror

Named

 * Calder, from Resurrection of the Daleks
 * Gazelle (Zagreus), a likely imaginary figure (BFA: Zagreus
 * Haval, a sergeant-at-arms to the Lord Geoffrey de Beauvain during the Crusades (TVC: The Magician)
 * Ishem, a United States Air Force sergeant guarding the Eleventh Doctor's dwarf star alloy prison in Day of the Moon
 * Kortez an eventual Colonel in UNISYC, who originally met the Doctor when he was a sergeant (EDA: Alien Bodies)
 * Jeff Kovacs, a World War II-era American sergeant (EDA: Autumn Mist)
 * Prozorov, a World War II-era Russian sergeant who served under Captain Sorin (DW: The Curse of Fenric)
 * Rugg, an imaginary sergeant called into existence by the Celestial Toymaker (DW: The Celestial Toymaker)
 * to Benik from DW: The Enemy of the World
 * Thompson (The War Games), a Confederate sergeant forced to participate in the War Games run by the War Lord (DW: The War Games)
 * Trofimov, a World War II-era Russian sergeant who served under Captain Sorin (DWN: The Curse of Fenric)

Named

 * Paterson, an ex-British Territorial Army sergeant whom the Seventh Doctor and Ace met (DW: Survival)

Unnamed

 * Sergeant (The Five Doctors), who was on Colonel Charles Crichton's staff at the time of the Brigadier's retirement (DW: The Five Doctors)
 * Sergeant (Spearhead from Space) from DW: Spearhead from Space
 * UNIT Sergeant (The Time Monster) from DW: The Time Monster

Named

 * John Benton, who served on the Brigadier's personal staff for a number of years, and who knew at least the Second, Third and Fourth Doctors, as well as several of the Doctor's other companions
 * Calhoun who served under Captain Magambo in DW: Planet of the Dead
 * Annie Frederick, a staff sergeant who was once in charge of public relations
 * French who served under General Alistair Gordon Lethbridge-Stewart (BFA: The Coup)
 * Hart (Doctor Who and the Silurians), from Doctor Who and the Silurians
 * Henderson (The Seeds of Doom), from The Seeds of Doom
 * Machi, a rogue UNIT soldier who once attempted to kill the Eleventh Doctor. (DWM: The Golden Ones)
 * Robin Marshall, a guard assigned to UNIT's Vault 75-73/Whitehall who was known to Liz Shaw (CC: Shadow of the Past)
 * Osgood (The Dæmons), a technical sergeant who helped the Third Doctor circumvent a barrier around Devil's End in DW: The Dæmons
 * James Ramsay, a UNIT soldier integral to an Auton invasion of Earth depicted in BBV Productions' Auton Trilogy
 * Talbot, who died while working with the Tenth Doctor and Majenta Pryce (DWM: The Age of Ice)
 * Mike Yates, who was a sergeant at the time he first met the Third Doctor and Liz Shaw. (MA: The Eye of the Giant)
 * Walters (The Invasion), who served under the Brigadier during the events of DW: The Invasion
 * Willis (The Wasting), a UNIT sergeant heard in BFA: The Wasting
 * Zbrigniev, who served under Brigadier Winifred Bambera during the events of Battlefield

Named

 * Bryn (The Twilight Kingdom) a soldier whom the Eighth Doctor, Charley Pollard and C'rizz in the Divergent Universe (BFA: The Twilight Kingdom)
 * Cook (The Indestructable Man), a sergeant in a prison, though not actually a government-run one, in PDA: The Indestructible Man
 * Stewart (The Indestructible Man) a sergeant in a militia force under the control of Mackenzie, who once had Jamie McCrimmon in his squad (PDA: The Indestructible Man)
 * Frith, head of security for the Forge at the time of the start of Project Lazarus
 * Kracauer, the leader of Kane's forces on Iceworld. (DW: Dragonfire)
 * Mitchell (Earthshock), a trooper seen in DW: Earthshock
 * Joseph Willow, a civilian who played the part of a sergeant in Sir George Hutchinson's war games in the village of Little Hodcombe (DW: The Awakening)
 * Zogroth, a sergeant of the Wrarth Warriors seen in DWM: The Star Beast

In-universe name
to be added

Behind the scenes

 * Joanne Sergeant, who played the maid in BBCR: The Ghosts of N-Space