| Una Kang Naging Akin | |
|---|---|
 Title card | |
| Also known as | When You Were Mine |
| Genre | Romantic drama |
| Based on | Una Kang Naging Akin (1991) by Laurice Guillen |
| Directed by | Joel Lamangan |
| Starring | |
| Theme music composer | Tata Betita |
| Opening theme | "Una Kang Naging Akin" by Ram Chaves |
| Country of origin | Philippines |
| Original language | Tagalog |
| No. of episodes | 80 |
| Production | |
| Executive producer | Camille Gomba-Montaño |
| Camera setup | Multiple-camera setup |
| Running time | 25–35 minutes |
| Production company | GMA Entertainment TV |
| Original release | |
| Network | GMA Network |
| Release | September 1 – December 19, 2008 |
| Infobox instructions (only shown in preview) | |
Una Kang Naging Akin (International title: When You Were Mine / transl. you became mine first) is a 2008 Philippine television drama romance series broadcast by GMA Network. Based on a 1991 Philippine film of the same title, the series is the tenth instalment of Sine Novela. Directed by Joel Lamangan, it stars Angelika Dela Cruz, Wendell Ramos, and Maxene Magalona. It premiered on September 1, 2008, on the network's Dramarama sa Hapon line up replacing Magdusa Ka. The series concluded on December 19, 2008, with a total of 80 episodes.