- Jonah, the Old Testament prophet, perhaps best known for being swallowed by (and living for a time inside) a "great fish" and for his disobedience
- The Book of Jonah, the story and prophecies of Jonah
It is noteworthy that the Apostle Peter is referred to in some passages (e.g. John 1:42) as the son of John, and in others as the son of Jonah (or Jonas). The two words are different names in Hebrew, but in New Testament Greek they are very similar, leading to discrepancies among some manuscripts.