Need to know is a category of classified information.

Need to know or Need to Know may also refer to:

• "Need to Know" (House), 2006 episode
• "Need to Know" (NCIS), 2012 episode of the American police procedural drama
• "Need to Know" (The Professionals), 1980 episode
• "Need to Know" (The Twilight Zone), episode of the 1985 series revival
• Need to Know (TV program), PBS TV and web newsmagazine

• "Need to Know" (Doja Cat song), 2021
• "Need to Know" (Wilkinson song), 2012
• "Need to Know", 2018 song by The Story So Far from Proper Dose

• Need To Know (newsletter), also known as NTK, technology newsletter published from 1997 to 2007

• I Need to Know (disambiguation)