NRO may stand for:

• National Reconciliation Ordinance, a Pakistani law
• National Reconnaissance Office, maintains United States reconnaissance satellites
• National Repertory Orchestra, in Colorado
• National Review Online, web version of the magazine National Review
• Nobeyama radio observatory, a division of the National Astronomical Observatory of Japan
• Non-resident Oriya, an informal term for people of Oriya ancestry
• Number Resource Organization, allocates IP numbers
• "Never Really Over", a song by Katy Perry, 2019