"Without You" is a song by Debbie Gibson released as a single exclusively in Japan in 1990. Gibson wrote the lyrics herself, with music written by a Japanese singer-songwriter Tatsuro Yamashita. Production credits were given to S. Andrew Zulla. It was featured on the Japanese television drama Otoko ni Tsuite (About Men) aired on TBS in 1990, and peaked at #26 on the Japanese Oricon chart.

In the following year, a co-writer reconstructed the song in alternative lyrics in Japanese written by him, under the title "Sayonara Natsu no Hi (さよなら夏の日)". Yamashita's interpretation was issued as one of the lead singles for his Artisan album, and gained more commercial success than original recording.

^*sales figures based on certification alone
^{^}shipments figures based on certification alone

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