* Tagalog: This was his native language, and he was a master of both its spoken and written forms.
* Spanish: He learned Spanish during his education and used it extensively in his writings, including his novels "Noli Me Tangere" and "El Filibusterismo."
* English: He studied English at Ateneo de Manila and was able to communicate in it effectively.
* French: He had a good command of French, which he learned through self-study and his travels.
* German: He also had a working knowledge of German, possibly due to his exposure to German literature during his time in Europe.
He likely also had some knowledge of other languages, such as Latin, Greek, and Arabic, due to his extensive studies in the humanities.