Matt Gabriel: sheriff in Blackwater Bay, Michigan, by Paula Gosling

Cecil Galant: examining magistrate in Cannes, France, by Jane Jakeman

Dr. Galimatias: semi-retired physician based in New Orleans, Louisiana, and Aramus P. Limpkin, professor of history at a college in Georgia, by H.O. Ward

Jan Gallagher: head of Special Security Projects at Jackson General Hospital in Abilene, Texas, by Jo Bailey

Kate Gallagher: commercial airline pilot by Kam Majd

Willi Gallagher: part-time English teacher, looking into her American Indian background, and Quannah Lassiter, a Lakota-speaking special investigator for the Texas Rangers, in Nickleberry, Texas, by Kat Goldring

Pat Gallegher: failed seminarian, retired forensic psychologist, and jazz musician, in New Orleans, Louisiana, by Richard Helms

Tim Gallen: IRS agent, and Maggie Connors, a stock broker, by Malinda Terreri

Theresa Galloway: plus-sized African-American personnel officer at the Department of Environmental Equity in Sacramento, California, by Terris McMahan Grimes

Jason Galt by Mark Lovell (Mark McShane)

Armand Gamache: Chief Inspector of the Sûreté du Québec, in the village of Three Pines, in southern Quebec, Canada, by Louise Penny

Clara Gamadge: widow of Henry, the forgery expert, in New York City, by Eleanor Boylan

Henry Gamadge: author, bibliophile, and forgery expert, in New York City, by Elizabeth Daly

Rowan Gant: Wiccan disciple in St. Louis, Missouri, by M.R. Sellars

Charlie Gants: ex-homicide detective in Texas, by Richard K. Abshire

Christine Garcia y Grant: ex-lawyer running a bed and breakfast in Taos, New Mexico, in the Taos Festival Mysteries by Mari Ulmer

Dave Garnett: resistance fighter in Soviet-occupied Britain, by Clive Egleton

Garrett: 30-something human private investigator in fantasy TunFaire, by Glen Cook

Amanda Garrett: commander of a stealth US Navy warship in the near future, by James H. Cobb

Dave Garrett: disbarred lawyer turned private eye in Lancaster County, Pennsylvania, by Neil Albert

Maggie Garrett: young, lesbian private investigator in San Francisco, California, by Jean Taylor

Callahan Garrity: cleaning business owner in Atlanta, Georgia, by Kathy Hogan Trocheck

Bill Gastner: insomniac undersheriff, and Estelle Reyes-Guzman, later the new undersheriff, in Posadas County, New Mexico, by Steven F. Havill

Ben Gates by Robert Kyle (Robert Terrall)

Jonathan Gaunt: external auditor the Queen in Edinburgh, Scotland, by Noah Webster (US) or Robert MacLeod (UK)

Drew Gavin: Albuquerque Gazette sports columnist in Albuquerque, New Mexico, by Steve Brewer

Nora Gavin: American pathologist, and Cormac Maguire, an Irish archaeologist, in Ireland, by Erin Hart

Angela Gennaro and Patrick Kenzie, private investigators in Dorchester, Massachusetts, by Dennis Lehane

George Gently: police inspector, later Chief Superintendent, based in East Anglia, England, by Alan Hunter

Calla Gentry: trial consultant in Tucson, Arizona, by Louise Ure

Dr. Edward George: retired Yale librarian in Washington DC, by Charles A. Goodrum

Kirth Gersen: hunter of nonhuman killers in the United States, in the Demon Princes series, by Jack Vance

Anthony Ruthven Gethryn: sleuth and sometime intelligence officer, son of an English squire and a Spanish actress, by Phillip MacDonald

Walter Ghost: amateur detective, by Vincent Starrett

Inspector Ganesh Ghote: police inspector in Bombay, India, by H.R.F. Keating

Bert Gibbons and Mike Tozzi, FBI agents in New York City, by Anthony Bruno

Carole Ann Gibson: black criminal defense attorney in Washington DC, by Penny Mickelbury

Jeremiah X. Gibson: assistant district attorney in New York City, by Hampton Stone (Aaron Mark Stein)

Barry Gilbert and Joe Lombardo, homicide detectives, in Toronto, Ontario, Canada, by Scott Mackay

Erin Gilbert and Steve Sullivan, rival interior designers in Colorado, in the Domestic Bliss Mysteries by Leslie Caine

Eve Gill: young sleuth frequently dealing with problems caused by her liquor-smuggling father, in England, by Selwyn Jepson

Superintendent Gillant: chief constable in Yorkshire, England, by John Wainwright

Patrick Gillard: British army major, and Ingrid Langley, a novelist and British Agent, by Margaret Duffy

Grace Gillespie: nurse-physiotherapist, in the UK, by Gerald Hammond

Kate Gillespie: homicide inspector in San Francisco, California, by Robin Burcell

Christian Gillette: CEO of Everest Capital, a Manhattan-based investment firm, in New York City, by Stephen Frey

Meg Gillis: security officer in Los Angeles, California, by C.J. Songer

Dandy Gilver: well-to-do woman in 1920s Scotland, by Catriona McPherson

Mark Girland: high-living (when he can) ex-CIA operative by James Hadley Chase

Susan Given: asset forfeiture prosecutor in New York City, by Margaret Barrett & Charles Dennis

Raylan Givens: federal marshal in Florida, by Elmore Leonard

Alexandra Gladstone: doctor in Victorian Newton-on-Sea, England, by Paula Paul (Paula Carter)

Detective Chief Inspector (DCI) Glass: policeman in Liverpool, England, by Ron Ellis

Simone Glass: reporter for the tabloid “Asteroid” in Hollywood, California, by Alison Gaylin

Joseph C. Gleason: attorney in Arlington, Massachusetts, by Andrew McAleer

Sir Toby Glendower: 60-something archaeologist, and Penny Spring, a 60-something anthropologist, in Cambridge, England, by Margot Arnold

Paula Glenning: professor and writer, in London, England, by Anna Clarke

Karen Glick: feature writer for a Wall Street magazine, in New York City, by Lawrence Light

Abe Glitsky: black, Jewish cop, and Dismas Hardy, ex-cop bartender and ex-Assistant District Attorney turned defense attorney, in San Francisco, California, by John Lescroart

Lord Godwin, bailiff in Hexham, in 13th century England, by Sara Conway

Alexander Gold: construction engineer and puzzle maven, in New York City, by Herbert Resnicow

Ariel Gold: amnesiac television newsmagazine producer in Los Angeles, California, by Judy Mercer

Eamon Gold: private investigator in San Francisco, California, by Richard Helms

Glad Gold: English professor, and Alden Chase, a chief of police, and in Wading River, Massachusetts, by Theodora Wender

Gladdy Gold: Florida’s Oldest Private Eye and her gang of retirees, in Fort Lauderdale, Florida, by Rita Lakin

Natalie Gold: reporter on the horse show circuit in Charlotte, North Carolina, by Jody Jaffe

Rachel Gold: lawyer in Chicago, Illinois, and then St. Louis, Missouri, by Michael A. Kahn

Sheldon Gold: mentor to Mairead O’Clare, a lawyer, in Boston, Massachusetts, by Terry Devane

Jay Goldstein and Carlos Cruz, homicide detectives in Oakland, California, by Marilyn Wallace

Kiki Goldstein and Hannah Malloy, an unlikely pair of 60-something sisters in Marin County, California, by Annie Griffin

Luis Gonzalo: policeman in Puerto Rico, by Seven Torres

Dr. Sally Good: head of the English and Fine Arts departments at Hughes Community College in Texas, by Bill Crider

Rayford Goodman: jaded, once-famous private investigator, and Mark Bradley, a gay writer of celebrity biographies, in Los Angeles, California, by Stan Cutler

Augusta Goodnight: Guardian angel, by Mignon F. Ballard

Elizabeth Goodweather: 50-something widow and proprietor of an herb and flower farm near Asheville, North Carolina, in the Appalachians, by Vicki Lane

Gordianus the Finder: private investigator in the 1st century BCE in Rome, Italy, by Steven Saylor

Ellie Gordon: law firm office manager in Orange County, California, by Karin Berne

Lindsay Gordon: lesbian journalist and socialist, in Glasgow, Scotland, by Val McDermid

Roy Grace: Detective Superintendent of the CID, in Sussex, England, by Peter James

Alan Graham: contract archaeologist in Baton Rouge, Louisiana, by Malcolm Shuman

Annabella Graham: crossword puzzle editor for the Newcastle Evening Crier, and Rosco Polycrates, a private eye, in Newcastle, Massachusetts, by Nero Blanc

Charlotte Graham: actress in New Jersey, by Stefanie Matteson

Davina Graham: British spy in the Cold War, by Evelyn Anthony

Liz Graham, Frank Shapiro, and Cal Donovan, cops in Castlemere, England, by Jo Bannister

Robert Graham: detective inspector in Eddathorpe, England, by Raymond Flynn

Cal Grant and high school friends in the late 1940s, in St. Paul and Minneapolis, Minnesota, by Stanley Gordon West

Alan Grant: Scotland Yard Inspector in London, England, by Josephine Tey

Celia Grant: botanist and horticulturist in London, England, by John Sherwood

Patrick Grant: professor at Oxford, England, by Margaret Yorke

General Ulysses Grant: returning to his hometown of Georgetown, Ohio, after the Civil War, by Jeffrey Marks 

Claire Gray: theatrical director in Palm Springs, California, by Michael Craft

Cordelia Gray: ledgling private investigator in London, England, by P.D. James

Helen Gray: FBI agent, and Peter Thorn, an army colonel and counter-terrorism expert, by Larry Bond

Joe Grey: cat and private investigator, by Shirley Rousseau Murphy

Lord John Grey: soldier and gentleman, in mid-18th century London, England, and elsewhere, by Diana Gabaldon

P.J. Gray: psychologist and computer expert in St. Louis, Missouri, by Shirley Kennett

Gale Grayson: American expatriate historian in England, by Teri Holbrook

Emma Greaves: by Lionel Black

Bedford Green: art gallery owner and his assistant Sloan Smith, in 1920s Greenwich Village, New York, by Michael Kilian

Bill Green: Detective Inspector and later DCI, and George Masters, Scotland Yard DCI and later Chief Superintendent, in London, England, by Douglas Clark

Katy Green: violin player in the Ultra Belles, an all-girl swing band in 1940s California, by Hal Glatzer

Michael Green: police inspector in Ottawa, Ontario, Canada, by Barbara Fradkin

Charlie Greene: female literary agent in Hollywood, California, by Marlys Millhiser

C.B. Greenfield: newspaper editor and musician, and Maggie Rome, a reporter and musician, in Sloan's Ford, Connecticut, by Lucille Kallen

Sophie Greenway: magazine editor and food critic for Minneapolis, Minnesota, in the Culinary Mysteries by Ellen Hart

Alan Gregory: clinical psychologist, and Lauren Crowder, an attorney, in Boulder, Colorado, by Stephen White

Joe Gregory and Anthony Ryan, police detective partners in New York City, by Ed Dee

Jennifer Grey: newspaper reporter and columnist in Chicago, Illinois, by Jerry Jenkins

Mother Lavinia Grey: Episcopal vicar and therapist, in Fishersville, New Jersey, by Kate Gallison

Linda Grey: in England, by Desmond Cory

Odelia Grey: plus-sized, middle-aged paralegal, in southern California, by Sue Ann Jaffarian

Paula Grey and Bob Newman, agents, and Tweed, British Secret Service second in command, by Corbin Forbes

Roman Grey: Gypsy art dealer in New York City, by Martin Cruz Smith

David Grierson: bank inspector, in London England, by Ian Stuart

Lew Griffin: black private investigator in New Orleans, Louisiana, by James Sillas

Simona Griffo: art buyer for an advertising firm and gourmet cook in New York City, by Camilla T. Crespi

Henk Grijpstra, Rinus de Gier, and the Commisaris, police detectives in Amsterdam, The Netherlands by Jan Van De Wetering

Simeon Grist: four-degreed private investigator in Los Angeles, California, by Timothy Hallinan

Alan Grofield: actor and part-time bank robber, in New York City, by Richard Stark (Donald E. Westlake)

Ebenezer Gryce: police detective in New York City, by Anna Katherine Green

Salvatore Guarnaccia: marshal in the Italian Carabinieri in Florence, Italy, by Magdalen Nabb

Thora Gudmundsdottir: lawyer in Reykjavik, Iceland, by Yrsa Sigurdardottir

Guido Guerrieri: jaded defense lawyer in Bari, Italy, by Gianrico Carofiglio

Leo Guild: 1980s bounty hunter in the western United States, by Ed Gorman

Claire Gulliver: middle-aged librarian turned travel bookshop owner, by Gayle Wigglesworth

Neil Gulliver: former newspaper crime reporter, and former spouse Stevie Marriner, a soap opera star, in Los Angeles, California, by Robert S. Levinson

Martha Gunn: coroner in Shrewsbury, England, by Priscilla Masters

Aaron Gunner: black private investigator in Los Angeles, California, by Gar Anthony Haywood

Bernie Gunther: German private eye who hates the Nazis, in Berlin, Germany, 1936-47, by Philip Kerr

Joe Gunther: police detective in Brattleboro, Vermont, by Archer Mayor

Nathanial Gye: paranormal investigator based in Cambridge, England, by Derek Wilson