| Johanna Masdani | |
| Birth Date: | 1910 11, df=y |
| Birth Place: | Amurang, Minahasa, North Sulawesi, Dutch East Indies |
| Death Place: | Jakarta, Indonesia |
| Alma Mater: | University of Indonesia |
Johanna Tumbuan Masdani (29 November 1910 - 13 May 2006), also known as Jo Masdani, was a pioneering figure in Indonesian independence. She was born Johanna Tumbuan in Amurang, in the region of Minahasa in North Sulawesi. She was present during two important events in Indonesian history, namely the Youth Pledge during the Second Youth Congress (or Kongres Pemuda Kedua) in 1928 and the Proclamation of Indonesian Independence in 1945. She graduated and taught in the Faculty of Psychology at the University of Indonesia.
Johanna was among those who attended the Second Youth Congress in October 1928 and took part in pledging the Youth Pledge.[1] In addition, Johanna also witnessed the Proclamation of Indonesian Independence that was announced by Sukarno and Mohammad Hatta on 17 August 1945.[2] A year later, Masdani organized the building of a monument to commemorate the proclamation event. The monument was built in front of Sukarno's house where the proclamation took place on 56 Pegangsaan Timur Street (now Proklamasi Street) in Jakarta, which is now Proclamation Park (or Taman Proklamasi). This is a different monument from the monument featuring Sukarno and Hatta in the same park.[3]
In 1961, Masdani completed her studies in the Faculty of Psychology at the University of Indonesia. She became a psychiatrist and also taught at her almamater. She continued her studies in the United States and Britain after her husband, Masdani, died in October 1967.
Johanna Tumbuan Masdani died on 13 May 2006 and was buried in Kalibata Heroes' Cemetery on 15 May 2006.
Johanna Masdani was acknowledged by the Indonesian government several times through the conferring of several honors:[4]