J17, J-17 or J.17 may refer to :

In military

• JF-17 Thunder, a fighter aircraft developed by China and Pakistan
• HMS Speedy (J17), a 1939 British Royal Navy Halcyon class minesweeper

In transportation

• WLWR Class J17, an Irish steam locomotive
• LNER Class J17, a 1900 British class of 0-6-0 steam tender locomotives
• County Route J17 (California), a road in California, United States

In science and academia

• Herse, a natural satellite of Jupiter, formerly designated "S/2003 J 17".
• Small nucleolar RNA snR60/Z15/Z230/Z193/J17
• Pneumonia in disease classified elsewhere ICD-10 code{{clarify|date=November 2011}}

In publications and media

• Just Seventeen, a UK magazine for teenage girls (1983–2004)

• Terry, MS
• Terry, MT
• Terry Mulholland
• Terry Murphy
• Terry Murphy (broadcaster)
• Terry Murphy (snooker player)
• Terry Nation
• Terry Neill
• Terry Nichols
• Terry Norris
• Terry Nutkin
• Terry Nutkins
• Terry O'Connor (Canadian politician)
• Terry Oldfield
• Terry O'Neill (photographer)
• Terry O'Quinn
• Terry Patchett
• Terry Pathmanathan
• Terry Paxton Bradshaw
• Terry Pendleton
• Terry Pluto
• Terry Porter
• Terry Prachett
• Terry Pratchett
• Terry Pratchett's Discworld