"Je ne sais quoi" is an Icelandic eurodance song composed by Örlygur Smári and Hera Björk and performed by Hera Björk, and was the Icelandic entry at the Eurovision Song Contest 2010, held in Oslo, Norway on 25, 27 and 29 May 2010.

The song is performed in English with some phrases in French (namely the phrases "Je ne sais quoi," I don't know what, and "Je ne sais pas pourquoi," I don't know why).

"Je ne sais quoi" was the winner of the Söngvakeppni Sjónvarpsins 2010 contest, organised by Icelandic broadcaster Ríkisútvarpið (RÚV) to select the Icelandic entry for the contest.

[1][2] Despite being one of the early favorites and the fans' favorite to win the contest and finishing 3rd with 123 points in the semi-final, the song ended up finishing 19th with 41 points.

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