Russell Quant: ex-farmboy, half-Ukrainian, half-Irish, gay private detective, in Saskatoon, Saskatchewan, Canada, by Anthony Bidulka

Quantrill, Douglas: detective chief inspector in East Anglia, England by Sheila Radley

Francis Quarles: by Julian Symons

Quarry: psychotic Vietnam vet and hired killer in Iowa by Max Allan Collins

Everard Peter Quayle: part of a top-secret British counter-intelligence unit working against Nazi agents, by Peter Cheyney

Queen, Ellery: author in Wrightsville, New York by Queen, Ellery

Quick, Faye: a PI in 1943 in New York, New York by Sandra Scoppettone

Ellie Quicke: 50-ish widow and amateur sleuth, in the suburbs of London, England, by Veronica Heley

Ariel Quigley: college English teacher with psychic powers, in Alexandria, Virginia, by Honora Finkelstein and Susan Smily

Quilliam, Meg: chef in Hemlock Falls, New York by Claudia Bishop

Quilliam, Sarah: inn owner in Hemlock Falls, New York by Claudia Bishop

Fritillary “Tilly” Quilter: arson investigator, and Isaac “Ike” Blessing, a private detective, in New York City, by Shelly Reuben

Quinlin, Jeb: a homicide investigator, recovering alcoholic in Dallas, Texas by Howard Swindle

Quincannon, John: 19th century private eye in San Francisco, California by Bill Pronzini

Quinn: ex-cop turned private investigator, in Spokane and Seattle, Washington, by Anne Argula

Quinn: a crime reporter by Harry Carmichael

Quinn, Nina: the owner of Taken By Surprise a landscaping firm specializing in surprise garden makeovers, in Ohio by Heather Webber

Quinn, Terry: white and barely holding on are ex-cops turned private investigators in Washington D. C. by George P. Pelecanos

Carroll Quint: entertainment critic for a newspaper in San Francisco, California, by Jerry Kennealy

Quint, Hugh: an ex-police detective turned private investigator in New Hampshire by by Steve Sherman

Quirke: coroner in 1950s Dublin, Ireland, by Benjamin Black (John Banville)

Quist, Julian: a public relations genius by Hugh Pentecost

Imogen Quy: nurse in St. Agatha’s College, in Cambridge, England, by Jill Paton Walsh

Qwilleran, Jim: journalist and owner of Koko and Yum Yum in Pick Ax City, Minnesota, by Lilian Jackson Braun