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

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

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

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

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

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

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: 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

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

Quist, Julian: a public relations genius by Hugh Pentecost

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