Helen, who traded a lavish lifestyle to working in a boutique at minimum wage in Florida by Elaine Viets

Haagen, Anneke: a computer consultant in Ann Arbor, Michigan by Susan Holtzer

Hagen, a government agent in the U.S.A. by Kay Hooper

Hagen, Richard: a 1940s diamond dealer in Antwerp, Belgium by J. Robert Janes

Hager, Clark: an FBI-trained profiler working in North Carolina by Jeff Pate

Haggerty, Leo: a rough and tough private investigator in Washington D. C. by Benjamin Schutz

Haggerty, Lindy: a rehearsal director and retired dancer by Shelley Freydont

Haller, Mike: a private eye specializing in missing persons in San Francisco, California by Max Byrd

Halley, Sid: injured steeplechase jockey turned private eye in England by Dick Francis

Hambledon, Tommy: a master spy of England by Manning Coles

Hamel, Neil: attorney and investigator, in Albuquerque, New Mexico by Judith Van Gieson

Hammer, Mike: private eye in New York, New York by Mickey Spillane

Hampton, Blanch: a Scotland Yard detective superintendent in London, England by Trevor Barnes

Hanks, Arly: small-town police chief in Maggody, Arkansas by Joan Hess

Hanna, Gabe: his deputy in New Mexico by Micah S. Hackler

Hannasyde, Superintendent: police superintendent in England by Georgette Heyer

Hannay, Richard: an ordinary fellow caught up in extraordinary events in England by John Buchan

Hannibal, Nick: a homicide detective in Boston, Massachusetts by Sophie Belfort

Hansen, Em: forensic geologist in Wyoming by Sarah Andrews

Harald, Sigrid: Police lieutenant in New York, New York by Margaret Maron

Hardaway, Anne: a ghostwriter in Oceanside Heights, New Jersey by Beth Sherman

Hardesty, Dick: a gay detective by Dorien Grey

Hardin, Art: a retired colonel, now a low-keyed private investigator in Grand Rapids, Michigan by Robert E. Bailey

Harden, Bart: a tough Broadway editor in New York, New York; by David Alexander

Hardesty, Wil: a Vietnam Vet private investigator in Los Angles, California by Richard Barre

Harding: an unlicensed private investigator in Chicago, Illinois by John Wessel

Harding, Gwen: New York City journalist turned suburban wife and mother in upstate New York by Laurien Berenson

Hardy, Cliff: a private investigator in Australia by Peter Corris

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

Hardy-Maratos, Annabelle: the deaf president of a large Miami security firm in Miami, Florida by Hialeah Jackson

Haristeen, Mary Minor: postmistress and her cat, Mrs. Murphy, in Crozet, by Rita Mae Brown

Harley, Paul: by Sax Rohmer

Harmas, Steve: by James Hadley Chase

Harper, Albenia “Benni”: an ex-rancher and folk art museum curator in San Celina, California by Earlene Fowler

Harper, Lew: the movie name for Ross MacDonald's Lew Archer character by Ross MacDonald

Harpur, Colin: detective chief superintendent in an English seaport by Bill James

Harrington, Sally: a television journalist in Connecticut by Laura Van Wormer

Harris, Leah: Seattle Police Detective Sergeant in Seattle Washington by Michael A. Hawley

Harris, Paul: a Scot with a heavy equipment business in Singapore by Gavin Black

Harris, Meg: an escapee from Toronto and a failed marriage retreats to the remote wilderness of West Quebec, where she fights any injustice by R. J. Harlick

Chip Harrison by Lawrence Block

Hartley, Beth: an attorney turned legal researcher in Milwaukee, Wisconsin by Kathleen Anne Barrett

Haskell, Ben: writer/chef  in Chitterton Falls, England by Dorothy Cannell

Haskell, Ellen: interior decorator in Chitterton Falls, England by Dorothy Cannell

Haskell, Vejay: Pacific Gas & Electric meter reader, in northern California by Susan Dunlap

Hastings, Frank: Sergeant (later, Lieutenant) a co-commander of SFPD homicide in San Francisco, California by Collin Wilcox

Hastings, Stanley: married actor and private eye in New York, New York by Parnell Hall

Hatch, Jake: railroad detective in the United States by Robert Campbell

Hatcher, Amos: the art world's foremost detective by Oliver Banks

Hawkin, Alonzo: homicide detective in San Francisco, California by Laurie R. King

Hawks, Joaquin: a CIA operative by Bill S. Ballinger

Hawley, Bill: an undertaker by Leo Axler

Hawthorne, Connor: a lesbian mystery novelist and former district attorney by Lauren Maddison

Haycastle, Matilda: a temporary in Brussels, Belgium by Michele Bailey

Haydon, Stuart: homicide detective in Houston, Texas by David L. Lindsey

Hayes, Cinda: an attorney and the director of the Boulder County Rape Crisis Center, in Boulder County, Colorado by Marianne Wesson

Hayes, Karen: a staff lawyer for Shoreview Memorial Hospital in Illinois by Michael Biehl 

Hayes, Nanette: a jazz-playing saxophonist, in New York, New York by Charlotte Carter

Hayle, Tamara: black ex-cop turned PI in Newark, New Jersey by Valerie Wilson Wesley

Hazard, Amanda, a sexy small-town CPA in Vamoose, Oklahoma by Connie Feddersen

Hazelrigg , Inspector: a British police inspector in London, England by Michael Gilbert  

Heffernan, Gerry: his boss in South Devon, England by Kate Ellis

Heimrich, Merton: lieutenant for the New York State Police Bureau of Criminal Identification by Richard Lockridge

Helm, Ben: ex-cop turned private eye in New York, New York by Bruno Fischer  

Hewitt, Martin: a solicitor's clerk  in turn-of-the-century London, England by Arthur Morrison

Hilderbrand, Lieutenant: a homicide detective in Houston, Texas by J. W. Kerr

Helewise, Abbess: an abbess at the Hawkenly Abbey in England, during the 12th century by Alys Clare

Heller, Nate: 1930s ex-cop turned private investigation in Chicago, Illinois by Max Allen Collins

Hemlock, Jonathan: art professor and government hit man by Trevanian

Hemingway, Ernest: expatriate writer in Paris in the 20's by Walter Satterthwait

Henderson, Edwina “Eddie”: woman officer in the Royal Canadian Mounted Police, in Sechelt, British Columbia, Canada, is featured in the continuation of the Karl Alberg series by L.R. Wright

Hennessey, George: chief inspector with the North Yorkshire Police in England by Peter Turnbull

Hennings, Rachel: a bookstore owner in Los Angeles, California by Jon Breen

Henry, Kate: baseball sportswriter in Toronto, Canada by Alison Gordon

Henshaw, Susan: Connecticut suburban housewife sleuth by Valerie Wolzien

Herald, Nick: a professional genealogist in New Orleans, Louisiana by Jimmy Fox

Hershey, Claudia: a police detective in Florida by Laura Belgrave

Hickey, Tom: private investigator during the 1940s and 1950s in California and Nevada by Ken Kuhlken

Higgins, Brett: in Detroit, Michigan by Therese Szymanski

Hightower, Karen: (aka Bast), a white witch and graphic designer in New York, New York by Rosemary Edghill

Hill, Dr.: a profiler by Val McDermid

Hill, Darby: a communication expert in Oakland, California by Louise M. Hoblitt

Hill, Inspector Judy: a cop in East Anglia, England by Jill McGown

Hill, Nicolette (Nikki): 30-something black prosecutor in Los Angeles, California by Dick Lochte and Christopher Darden

Hines, Jake: a police detective in Rutherford, Minnesota by Elizabeth Gunn

Hinshaw, Willa: a spunky associate minister at Liverpoole First United Methodist Church. In Liverpoole, North Carolina by Lynette Hampton

Hoag, Stewart “Hoagy”: celebrity ghostwriter in the United State by David Handler

Hoffman, Nick: a gay professor in Michiganapolis, Michigan by Lev Raphael

Holcomb, Lenny: an obituary writer in Harrisburg, Pennsylvania by John Luciew

Holden, Vicky: an Arapaho attorney in Wind River Reservation, Wyoming by Margaret Coel

Holder, Tom: an overweight 40-something police chief in the affluent university town of Harton, New Jersey by Cristina Sumners

Holland, Billy Bob: attorney and former Texas Ranger in Deaf Smith, Texas by James Lee Burke

Holland, Primrose: an ex-pathologist turned advice columnist in Skipley, England by Jo Bannister

Hollister, Grace: an American schoolteacher and literary scholar visiting her favorite poets' old haunts in England’s Lake District, is featured in the Poetic Death Mysteries by Diana Killian

Holloway, Barbara: Oregon defense attorney by Kate Wilhelm

Hollowell, Patricia Anne: “Mouse”: housewife and sister in Alabama by Anne George

Holmes, Mycroft: Sherlock’s older brother, in London, England by Quinn Fawcett

Holmes, Sherlock: a detective in London, England by Rick Boyer

Holmes, Sherlock: a detective in London, England by Carole Bugge

Holmes, Sherlock: a detective in London, England by Philip J. Carraher

Holmes, Sherlock: a detective in London, England by Arthur Conan Doyle

Holmes, Sherlock: a detective in London, England by Loren D. Estleman

Holmes, Sherlock: a British detective in USA by Larry Millett

Holmes, Sherlock: a detective by Daniel Stashower

Holmes, Sherlock: a detective in London, England by Wayne Worcester

Holroyd, Nick: a detective inspector in Dorset, England by Ann Quinton

Holt, Max: a young genius, animal rights activist in Beaumont, South Carolina by Janet Evanovich with Charlotte Hughes

Holt, Samantha: a veterinary technician in Paradise Cay, Florida by Karen Ann Wilson

Holt, Reverend Lucas: an Episcopal priest and ex-prison chaplain in Austin, Texas by Charles Meyer

Homes, Schlock: a satire of Sherlock Holmes in London, England by Robert L. Fish

Hook, Detective Sergeant Bert: a policeman and golf enthusiast in Oxford, England by J. M. Gregson

Hope, Alison: software designer in Hop Valley, England by Susan B. Kelly

Hope, Matthew: attorney in Florida by Ed McBain

Hopkins, Lloyd: detective sergeant in Los Angeles, California by James Ellroy

Hopkins, Marty: a deputy sheriff in Nichols County, Indiana by P. M. Carlson

Hopkins, Ward: a former CIA agent who continually crosses paths with a serial-killer cult by Michael Marshall

Hopper, Turing: an Artificial Intelligence Personality (AIP) is Crystal City, outside Washington D.C. by Donna Andrews

Horne, Evan: a jazz piano player with an injured hand by Bill Moody

Houdini, 19th century escape artist in London, England by Walter Satterthwait

Houdini, Harry: an escape artist by Daniel Stashower

House, Duffy: a ex-sportswriter turned investigator in Chicago, Illinois by Crabbe Evers

Houseman, Carl: deputy sheriff in Iowa by Donald Harstad

Howard, Jeri: a private investigator in Oakland, California by Janet Dawson

Howard, Sheriff Sharyn: in Diamond Springs, North Carolina by Joyce and Jim Lavene

Hoyland, Tamara: a British secret agent archaeologist in England by Jessica Mann

Hubbert, Theodore: a retired  Wall Street executive in New York, New York by Gallagher Gray 

Huckleberry, Honey: a book rep, based in Fort Worth Texas by Margaret Moseley

Mrs. Hudson: housekeeper and the other sleuth of Baker Street, in London, England by Sydney Hosier

Hudson, Robin: cable news reporter in New York, New York by Sparkle Hayter

Hunnechurch, Pippa: owner of her own executive recruiting firm in Ryde, Maryland by Ron Benrey & Janet Benrey

Hunt, Claire: local celebrity in St. Louis, Missouri by Robert J. Randisi

Hunt, Gil: bookstore owner in St. Louis, Missouri by Robert J. Randisi

Hunter, Diana: a private eye in Southern California by Joan Francis Hunter, Ed: a young teenager in Chicago, Illinois by Fredric Brown

Huss, Irene: a detective inspector in the Violent Crimes Unit in Goteborg, Sweden by Helene Tursten

Huuygens, Kek: a Pole using a Dutch name and an American passport is a smuggler in Europe by  Robert L. Fish

Hyatt, Lexy: a crime reporter in Florida by Carlene Miller