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Enneaphobia (from Greek ennea meaning "nine") also known as nonaphobia (from Latin novem meaning "nine") is the fear of number nine. It is a rare phobia and it is not recognized by the medical literature.

Enneaphobia may commonly be triggered due to being disappointed of achieving near perfect scores or near-completions, like achieving 9/10 in the quiz often but rarely getting 10/10, while seeing a family member die less than a year before their new decade (e.g. dying at the age of 69).

Enneaphobia is usually not a severe phobia, but sufferers would often avoid the triggers. Enneaphobes would try to avoid encountering the number that ends with nine especially, e.g. 39, 449. A enneaphobe may not like to live in the house that has the address ending with nine. Sufferers would avoid look at prices as many of them ends with nine, while thinking that it should be one cent higher. Enneaphobes who are baseball fans would think that the games should last 10 innings instead of 9, and so they could lose interest in baseball. Sufferers may not mind to chronologically assign the age ending with nine.

Number nine is sometimes considered an unlucky number in Japan since the word nine in Japanese has similar pronunciation as their word meaning torture or suffering.

When 8-year-olds turn 9,they may still want to called an 8-year-old till they turn 10. Most people in Germany hate this number because it sounds like "Nein",one of Adolf Hitler's catchphrases.

Number phobias
Oudenophobia (fear of 0) · Henophobia (fear of 1) · Dyophobia (fear of 2) · Triskaphobia (fear of 3) · Tetraphobia (fear of 4) · Pentaphobia (fear of 5) · Hexaphobia (fear of 6) · Heptaphobia (fear of 7) · Octophobia (fear of 8) · Enneaphobia (fear of 9) · Decaphobia (fear of 10) · Hendecaphobia (fear of 11) · Dodecaphobia (fear of 12) · Triskaidekaphobia (fear of 13) · Hexadecaphobia (fear of 16) · Heptadecaphobia (fear of 17) · Octodecaphobia (fear of 18) · Enneadecaphobia (fear of 19) · Eikositriophobia (fear of 23) · Eikosihexaphobia (fear of 26) · Triakontenneaphobia (fear of 39) · Tessarakontadyophobia (fear of 42) · Tessarakontaheptaphobia (fear of 47) · Pentekontoctophobia (fear of 58) · Hexekontadyophobia (fear of 62) · Hexekontenneaphobia (fear of 69) · Hebdomekontahenophobia (fear of 71) · Ogdokontaheptaphobia (fear of 87) · Enenekontenneaphobia (fear of 99) · Hekatophobia (fear of 100) · Hekatohendecaphobia (fear of 111) · Hekatenenekontahenophobia (fear of 191) · Diakosioihekkaidekaphobia (fear of 216) · Diakosioipentekontaphobia (fear of 250) · Triakosioitriakontatriophobia (fear of 333) · Tetrakosioeikosiphobia (fear of 420) · Pentakosioipentekontahenophobia (fear of 551) · Hexakosioihekkaidekaphobia (fear of 616) · Hexakosioihexekontahexaphobia (fear of 666) · Heftakosioitessarakontaheptaphobia (fear of 747) · Enniakosioihendecaphobia (fear of 911) · Enniakosioenenekontenneaphobia (fear of 999) · Tessarakontadyochilahexekontenneaphobia (fear of 42069) · Compustitusnumerophobia (fear of composite numbers) · Meganumerophobia (fear of large numbers) · Imparnumerophobia (fear of odd numbers) · Omalonumerophobia (fear of even numbers) · Piphobia (fear of pi) · Phiphobia (fear of the golden ratio) · Primonumerophobia (fear of prime numbers) · Paranumerophobia (fear of irrational numbers) · Neganumerophobia (fear of negative numbers)
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