The acronym CREN may refer to:

• Christian Real Estate Network, a private real estate association
• Club de Radioexperimentadores de Nicaragua, an amateur radio organization in Nicaragua
• Corporation for Research and Educational Networking, organizational home for the computer networks Bitnet and later CSNET

• Reissue
• Reistad
• Reis' telephone
• Reisterstown
• Reisterstown (MD)
• Reisterstown Plaza Metro Subway Station
• Reisterstown Road
• Reistertown
• Reistingen Abbey
• Reistingen Monastery
• REISUB
• Reisub
• Reis ül-Küttab
• Reit
• Reita Faria Powell
• Reitaku
• Reitaku University
• Re, Italy
• Reitan Group
• Reitangruppen
• Reitangruppen AS
• Reitan Narvesen
• ReitanNarvesen
• Reitano
• Reiter (disambiguation)