| O | |
| Letter: | Օ օ |
| Imagesize2: | 195px |
| Imagealt2: | Letter O handwritten |
| Script: | Armenian script |
| Type: | Alphabet |
| Typedesc: | ic |
| Language: | Armenian language |
| Phonemes: | [o] |
| Unicode: | U+0555, U+0585 |
| Alphanumber: | 38 |
O or Oh (majuscule: Օ, minuscule: օ, hy|օ) is the 38th letter of the reformed Armenian alphabet and the 37th letter of the classical Armenian alphabet. This letter was first noticed in a text from the year 1046 at the work փափագանօք (p'ap'aganok').[1]
Unlike many Armenian letters, O has no numeric value.[2]
It represents the /o/ sound in both Eastern and Western Armenian.[3]