| Ko Nom Sao | |
| Native Name: | เกาะนมสาว |
| Coordinates: | 8.3123°N 98.5172°W |
| Location: | Strait of Malacca |
| Elevation Footnotes: | [1] |
| Elevation M: | 10 |
| Country: |  Thailand |
| Country Admin Divisions Title: | Province |
| Country Admin Divisions Title 1: | District |
| Country Admin Divisions 1: | Mueang Phang Nga |
| Country Admin Divisions Title 2: | Tambon |
| Country Admin Divisions 2: | Ko Panyi |
Ko Nom Sao (th|เกาะนมสาว, lit. female breast island) are twin islands in Phang Nga Bay, and are part of the Ko Panyi (เกาะปันหยี) subdistrict (tambon),[2] Phang Nga Province, Thailand.
Ko Nom Sao is a geographical feature consisting of two small islands of similar appearance located close to each other. One of them, Ko Nom Sao Yai (เกาะนมสาวใหญ่), is slightly larger than the other, but from certain angles the silhouette of these islands looks like a pair of roughly identical woman's breasts.[3]
These islands are also known as Ko Ok Meri.