Radcliffe, 24, said he is finding it quite tough at the moment as he is only just started, reported Contactmusic.
"I just started learning Japanese. It's super hard, but fascinating. My favourite word so far is tokidoki [which means sometimes] -- it sounds like 'okeydokey'," he said.
The actor is also able to speak a bit of Spanish after being taught it at school, but he believes the only reason he passed the language exam at the age of 16 is because he mastered the accent.
"I passed my Spanish GCSE (the UK's General Certificate of Secondary Education) thanks to my accent skills. My grammar was absolute crap.