IC3 (certification), the Internet and Computing Core Certification
I-C3 (In-Cell Charge Control), a type of NiMH battery patented by Rayovac
IC3 Convention Center, convention center in Cebu City, Philippines
Internet Crime Complaint Center, an American cyber crime task force composed of the FBI, National White Collar Crime Center and the Bureau of Justice Assistance
An abbreviation for indole-3-carbinol
"IC3", a song by British rapper Ghetts from his 2021 album Conflict of Interest