I Need to Know may refer to:

• "I Need to Know" (Tom Petty and the Heartbreakers song), a 1978 song by Tom Petty
• "I Need to Know" (Marc Anthony song), a 1999 song by Marc Anthony
• I Need to Know (TV series), a Nigerian television series

• Nicelli Airport
• Nicely (disambiguation)
• Nicely Formation
• Nice Matin
• Nice-Matin
• Nice Men
• Nice 'n Easy
• Nicene belief
• Nicene & Post-Nicene Fathers
• Nice 'N' Sleazy
• Nice Package
• Nice People (1922 film)
• Nice People (disambiguation)
• Nice People (play)
• Nice People (TV France)
• Nice Peter
• Nicepeter
• NicePeter
• Nicephoros Gregoras
• Nicephorus Basilacius
• Nicephorus Callistus Xanthopulus
• Nicephorus Const.
• Nicephorus I (disambiguation)
• Nicephorus II (disambiguation)
• Nicephorus II of Constantinople