Per Fredrik Wahlöö (5 August 1926 – 22 June 1975) – in English translations often identified as Peter Wahloo – was a Swedish author. He is perhaps best known for the collaborative work with his partner Maj Sjöwall on a series of ten novels about the exploits of Martin Beck, a police detective in Stockholm, published between 1965 and 1975. In 1971, The Laughing Policeman (a translation of Den skrattande polisen, originally published in 1968) won an Edgar Award from the Mystery Writers of America for Best Novel. Wahlöö and Sjöwall also wrote novels separately.
| Movie | Flygplan saknas | 1965 |
| Movie | Nattmara | 1965 |
| Movie | Nattmara | 1965 |
| Movie | The Man on the Balcony | 1993 |
| Episode |
Sjöwall Wahlöö: Historien om ett brott Roseanna |
1967 |
| Movie | Roseanna | 1993 |
| Movie | Beck 31 - Gunvald | 2016 |
| Movie | The Police Murderer | 1994 |
| Movie | 31. osakonna hukk | 1981 |
| Movie | The Laughing Policeman | 1973 |
| Movie | Kamikaze 1989 | 1982 |
| Episode |
Sjöwall Wahlöö: Historien om ett brott Mannen på taket |
1976 |
| Movie | Nezakonchennyy uzhin | 1981 |
| Movie | Murder at the Savoy | 1993 |
| Movie | Beck - De gesloten kamer | 1992 |
| Movie | Beck 09 - Hämndens pris | 2001 |
| Movie | Morianerna | 1965 |
| Movie | Mördaren - en helt vanlig person | 1967 |
| Movie | Man on the Roof | 1976 |
| Movie | Beck 08 - Spår i mörker | 1997 |
| Movie | Brandbilen som försvann | 1993 |
| Movie | The Man Who Went Up in Smoke | 1980 |
| Movie | Beck 13 - Okänd avsändare | 2002 |
| Series | Beck | 1999 |