Nineteen or 19 may refer to:

• 19 (number)
• One of the years 19 BC, AD 19, 1919, 2019

• 19 (film), a 2001 Japanese film
• Nineteen (1987 film), a 1987 science fiction film
• 19-Nineteen, a 2009 South Korean film
• Diciannove, a 2024 Italian drama film informally referred to as "Nineteen" in some sources

• Potassium, an alkali metal
• 19 Fortuna, an asteroid

• 19 (band), a Japanese pop music duo

• 19 (Adele album), 2008
• 19, a 2003 album by Alsou
• 19, a 2006 album by Evan Yo
• 19, a 2018 album by MHD
• 19, one half of the double album 63/19 by Kool A.D.
• Number Nineteen, a 1971 album by American jazz pianist Mal Waldron
• XIX (EP), a 2019 EP by 1the9

• "19" (song), a 1985 song by British musician Paul Hardcastle
• "Stone in Focus", officially "#19", a composition by Aphex Twin
• "Nineteen", a song from the 1992 album Refugee by Bad4Good
• "Nineteen", a song from the 2001 album Almost Heathen by Karma to Burn
• "Nineteen" (song), a 2007 song by American singer Billy Ray Cyrus
• "Nineteen", a song from the 2007 album The Con by Tegan and Sara
• "XIX" (song), a 2014 song by Slipknot
• 19, a song from the 2001 album Heartbreak in Stereo by Pencey Prep

• Highway 19; see List of highways numbered 19
• Renault 19, a small family car
• Tyrrell 019, a racecar
• Mecklenburg XIX, a class of German steam locomotives

• 19 Entertainment, a company owned by Sony Pictures Television

• COVID-19, an infectious disease
• Wireless Set No. 19, a Second World War mobile radio transceiver used by the British Army
• All pages with titles beginning with Nineteen
• All pages with titles beginning with XVIIII
• All pages with titles beginning with XIX
• All pages with titles beginning with 19
• All pages with titles containing nineteen
• All pages with titles containing xviiii
• All pages with titles containing xix
• All pages with titles containing 19