"Nada Sōsō" (涙そうそう^?, Great Tears Are Spilling) is a song written by Japanese band Begin and singer Ryoko Moriyama. It was first released by Moriyama in 1998, but achieved popularity through the cover version by Rimi Natsukawa in 2001.

The song first appears in Ryoko Moriyama's discography in 1998, as a track on her album Time Is Lonely, an album which did not even break the top 100 Oricon albums chart.

Moriyama re-released the song as the second A-side of the single "Satōkibi-batake/Nada Sōsō" in 2001, after Rimi Natsukawa's version had become popular. In 2003, a single featuring a special live version featuring Moriyama, Begin and Natsukawa was released.

Moriyama and Begin met after performing at live events together in the late 1990s. Moriyama asked Begin to write her an Okinawan-style song. The song's title on the demo tape she received was "Nada Sōsō," an Okinawan language phrase meaning "large tears are falling" (to compare, the Japanese phrase would be namida ga poroporo kobore ochiru (涙がぽろぽろこぼれ落ちる^?)). When Moriyama found out the meaning of the phrase, it reminded her of the death of her older brother. She kept the title, and based the lyrics she wrote around these feelings.

The lyrics speak of looking through an old photo-book at pictures of somebody who has died. The protagonist of the song is thankful to them for always encouraging them, and for being happy no matter what. They believe they will meet them again one day, and cries as they send thoughts of sadness and love to that person.

All songs arranged by Koji Igarashi.

Begin released a self-cover of the song as the band's 18th single on March 23, 2000. It appears on two 2000 albums by Begin: their Okinawan concept album Begin no Shima Uta (Omato-take O) and a regular studio album, Begin. Two versions backed with sanshin appear on Begin no Shima Uta (Omato-take O) (one in Japanese, one in Okinawan), while the regular studio version appears on Begin (and is backed with acoustic guitar and strings).

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