| Tonny Koeswoyo | |
|---|---|
| Birth name | Koestono Koeswoyo |
| Born |
19 January 1936 Tuban, East Java, Indonesia |
| Died | 27 March 1987 (aged 51) Jakarta, Indonesia |
| Genres | Rock, pop |
| Occupation(s) | Musician, singer-songwriter, artist |
| Instruments | Vocals, piano, guitar, keyboard |
| Years active | 1962–1987 |
Koestono "Tonny" Koeswoyo (19 January 1936 – 27 March 1987) was an Indonesian rock musician and leader of the music group Koes Plus. Koeswoyo played piano, guitar and keyboard.