What languages did Nikola Tesla speak?

Nikola Tesla was born in the Austrian Empire (now Croatia), and spoke Serbian as his native language. He was also fluent in German, English, French, Czech, Hungarian, and Italian. He likely learned German and Hungarian in school, as these were commonly spoken languages in the Austro-Hungarian Empire.

He learned English after moving to the United States in his late 20s, and his proficiency in English is evident in his extensive writings and lectures. He also traveled extensively throughout Europe and North America, which likely contributed to his fluency in French, Czech, and Italian.

It's important to note that there's no definitive record of exactly how many languages Tesla spoke or the extent of his fluency in each language. However, based on available information, it's clear he was a polyglot with a remarkable command of multiple languages.