Wilhelmus Zakaria Johannes (1895 – 4 September 1952) was an Indonesian radiology medical doctor.

Johannes was the first Indonesian medical doctor who learned radiology in the CBZ (Civil Hospital) in Batavia and then became an expert in Rontgen technology and had contributed a lot to the development of medical studies in Indonesia.

The Indonesian government honored WZ Johannes as a National Hero of Indonesia and named a general hospital in Kupang, East Nusa Tenggara after him.

Johannes died in 1952 and was buried at the Jati Petamburan Cemetery in Central Jakarta.

This biographical article related to medicine in Indonesia is a stub.