Nica or NICA may refer to:

• Nīca, a village in Latvia
• Nica, the name in some languages of Nice, a French city
• "Nica", a jazz tune composed by Sonny Clark

• Nica is an adjective which may refer to:
• Nica (name)
  • Nicaragua
  • Nicaraguan people
• National Iranian Canadian Assembly
• Nica Airlines, an alternate name for Nicaragüense de Aviación, a Nicaraguan airline
• National Institute of Circus Arts, an Australian circus school
• National Intelligence Coordinating Agency, a government agency in the Philippines
• Nica (butterfly), a genus of nymphalid butterflies in the Biblidinae subfamily
• National Ice Carving Association, a U.S. ice sculpture association
• Netherlands Indies Civil Administration, the World War II-era Dutch colonial administration in Indonesia
• Nicotine Anonymous (NicA), a stop-smoking program
• Northern Ireland Court of Appeal, part of the Courts of Northern Ireland
• Nuclotron-based Ion Collider fAcility, a proton and heavy ion collider under construction at JINR in Dubna, Russia

...