Oxford Inter-Collegiate Christian Union

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The Oxford Inter-Collegiate Christian Union, usually known as OICCU (/ˈɔɪkjuː/ OY-kew), is the world's second oldest university Christian Union and is the University of Oxford's most prominent student Christian organisation. It was formed in 1879.

Due to the strength of the Oxford Movement and later the Oxford Groups (alternative Christian movements), evangelical Christians in Oxford have generally faced a more pluriform environment than in Cambridge, and OICCU has tended to follow the general lead of its Cambridge counterpart, the Cambridge Inter-Collegiate Christian Union (CICCU).

OICCU admits postgraduate students as well as undergraduates, although postgraduates are eligible only for associate membership, and their needs may be better served by the Oxford Graduate Christian Forum.