"Can You Keep a Secret?" is a song by Hikaru Utada, released as her seventh Japanese-language single (9th overall) on February 16, 2001. It was the theme song for a Japanese television drama called Hero, Utada made a cameo appearance as well as her acting debut in this drama as a waitress. "Can You Keep a Secret?" debuted at #1 on the Oricon charts, selling 783,620 in its first week, and was her third single to be #1 for two consecutive weeks. The single has sold 1,485,000 to date. This single became the #1 single of 2001 in Japan. In the World Charts, Can You Keep a Secret reached #37 for single airplay and #9 for sales. The most recent figures (May 26, 2006) show that the single sold 1,484,940 units in total. This also remains to be one of Utada's fan favorites.
The music video for this song included a robot, whom Hikaru appeared to be in a relationship with.