| 16 Extended West Papuan | 16.1.5 Proto-Tabla-Sentani to Tabla | oi → oe
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| 17 Indo-European | 17.5.1 Proto-Indo-European to Old Irish | — {ai,oi} → iː / _#
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| 17.5.2 Proto-Celtic to Middle Welsh | uː {oi,ɔː} → yː uː
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| 17.6 Proto-Indo-European to Dacian | oi wo wj ow → ai wa vi aw
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| 17.7 Proto-Indo-European to Common Germanic | ei oi → iː ai
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| 17.7.2.1.9 Early Northern Middle English to Scots | — ai oi ui ei au ou iu ɛ(o)u → eː oe əi iː {ɑː,ɔː} ʌu ju j(ʌ)u
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| 17.11 Proto-Indo-European to Proto-Slavic | {ai,oi} → i / j_
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| {ai,oi} → æː
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| oi o → i ъ / “Sometimes in final syllables”
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| 17.12.1.1 Proto-Indo-European to Latin | oj → oi → oe → uː
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| ei oi ou → iː eː uː / %(C)(C)_ when unstressed
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| {ai,ei,oi} → ei → iː / _(C)(C)#
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| 17.12.1.1.1 Classical Latin vs. Vulgar Latin | {i,eː,oi} → e
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| 17.12.1.1.3 Latin to French | oi → wɛ → wa
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| 30 Niger-Congo | 30.3.1.1.3 Proto-Gbe to Proto-Fon | oi ɔi ɔ̃i {a,ɛ}i {ɛ̃,ẽ}i ei → oe ɔɛ ɔ̃ɛ̃ ɛɛ ɛ̃ɛ̃ ee
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| 42 Uralic | 42.1.1.1 Proto-Finnic to Proto-Finnish | oi → o / unstressed
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| 46 Vowel Shifts | 46.5 Old English-to-Scots Vowel Shifts | ai oi ui ei au ou iu ɛ(o)u → eː oe əi iː {ɑː,ɔː} ʌu ju j(ʌ)u
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| 46.10 Late Proto-Finnic to Savonian Vowel Shift | ei oi øi → eː oe øe
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