| Ninja | |
| Type: | Studio |
| Artist: | Christina Aguilar |
| Cover: | Ninja (album).jpg |
| Language: | Thai |
| Label: | GMM Grammy |
| Producer: | Chatree Kongsuwan |
| Next Title: | Arwut Lab |
| Next Year: | 1992 |
Ninja (Thai: นินจา) is the debut album by Thai singer Christina Aguilar, released by GMM Grammy on 21 December 1990. It was only the second album by a Thai artist to sell over 1,000,000 copies (the first was by Thongchai McIntyre) and the first album by a Thai female artist to sell 1,000,000 copies. In total, Ninja has sold over 1,900,000 copies in Thailand.
Singles that are still well known are "Ninja", "Prawat Sad (History)", "Plik Lock (Upside Down)", "Plao Rok Na (It isn't)" and "Hau Jai Khor Ma (My Heart Asked for It)".