"Je ne sais pas pourquoi" is a 1988 single by Kylie Minogue.

Je ne sais pas pourquoi may also refer to:

• "Je ne sais pas pourquoi", French version of "I Don't Know Why (I Just Do)"
• "Je ne sais pas pourquoi", a 1954 song by Mouloudji from the film Tout chante autour de moi
• "Je ne sais pas pourquoi", a song by Lise Darly from Si J'avais Su

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