- Operation Rainbow
- Operation Raket
- Operation Red Alert: The Iron Eagle Series Book Four
- Operation Red Herring
- Operation Red Sequoia
- Operation Rheingold
- Operation Rhombus
- Operation Romanow
- Operation Sahara
- Operation Saif
- Operation Sandalwood
- Operation Sandsturm
- Operation Schlosser
- Operation Schwarzer Drache
- Operation Scorpion
- Operation Sea Ghost
- Operation Second Chance
- Operation Second Honeymoon
- Operation Seewespe
- Operation Seshachalam
- Operation Sherlock
- Operation Shylock
- Operation Sifnos
- Operation Silicon
- Operation Smuggling
- Operation Smugler
- Operation Snehvide
- Operation Snemand
- Operation Soldier Next Door
- Operation Springertræk
- Operation Stakeout
- Operation Starfire
- Operation Stauffenberg
- Operation tango
- Operation Tiberias
- Operation Tomcat
- Operation Traction
- Operation Treasure
- Operation Trojan Horse
- Operation Tv Rød
- Operation udslettelse
- Operation Unleashed
- Operation Vesuv
- Operation Vesuvius
- Operation Vivienne
- Operation Waldemar
- Operation Washtub
- Operation Werwolf - Blutweihe
- Operation Werwolf - Ehrensold
- Operation Werwolf - Fememord
- Operation Whiplash
- Operation Zagreb
- Operation Zigzag
- Operation Zodiac
- Operation: Astronomical
- Operation: Everglades
- Operation: Eyewitness
- Operation: Forbidden
- Operation: Lancer
- Operation: Midnight
- Operation: Midnight Cowboy
- Operation: Midnight Escape
- Operation: Midnight Guardian
- Operation: Midnight Tango
- Operation: Monarch
- Operation: Refugees DEADcome
- Operative 66
- Operator Zero
- Operatory of Death
- Operatören
- Operazione Athena
- Operazione Bifrost
- Operazione Cigno Bianco
- Operazione Cristopher
- Operazione Grifone
- Operazione Madonnina
- Operazione Matador (Segretissimo SAS)
- Operazione Matrioska Per Cantagallo
- Operazione Petit-beurre
- Operazione Presidente (Un thriller di Luke Stone – Libro 5)
- Operazione reset
- Operazione Saba
- Operazione Wet Chick
- Operação Chaveiro
- Operação Espada
- OPERAÇÃO KAABA
- Operação P-2
- Operação Red Rabbit
- Operação Tesouro
- Operação Xeque-Mate
- Operação Ziguezague
- Opernball
- Opfer der Lust
- Opfer ohne Gewissen
- Opfer ohne Wahl
- Opfergabe
- Opferlämmer
- Opfermond - Ein Fantasy-Thriller
- Opfermoor
- Opferschuld
- Opferstock
- Opferstunde
- Opferwissen
- Opfindelsen, der dræbte
- Opgave til en snushane
- Opgør i Sinanju
- Opgør med fortiden
- Opgørets time
- Ophelia
- Ophelia mischt sich ein
- Ophelia's Flowers
- Ophelia, le vite di una ghost writer
- Ophelia, le vite di una ghost writer. Ambiguità occulte
- Ophelia, le vite di una ghost writer. Fatali utopie
- Ophelia, le vite di una ghost writer. Inconfessabili segreti
- Ophelia, le vite di una ghost writer. Inquietanti rivelazioni
- Ophelia, le vite di una ghost writer. Laguna nera