"Splash" is a Japanese song recorded by South Korean singer-songwriter Yesung. It was released as a double A-side with "Aishiterutte Ienai" on June 28, 2017, by Avex Trax.

Both songs were later featured on his debut Japanese studio album, Story, which was released in 2019.

"Splash" and "Aishiterutte Ienai" is Yesung's second Japanese single following "雨のち晴れの空の色 (Ame Nochi Hare no Sora no Iro)" which was released in October 2016.

On May 16, 2017, Yesung announced he will release his second Japanese single "Splash/Aishiterutte Ienai" on June 28. On May 25, Yesung announced he was in Macau to film the music video for "Splash". The promotional video was released exclusively on June 1, showing close-up footage and interviews.

Unlike his previous solo releases like "Here I Am" and "Paper Umbrella" which were ballads, "Splash" is categorized as a dance-pop song, while "Aishiterutte Ienai" is also a ballad.

Yesung introduced "Splash" as a typical Super Junior dance number with the image of early summer.

Novelist Ryū Murakami was credited as the lyricist for the latter track and said he wrote the lyrics in 10 minutes and added how he words "I love you" was actually more complex and deeper than it seems. Yesung was surprised that Murakami could provide the lyrics and commented how mature the song is.

Shortly after the release of the single, Yesung embarked on a series of small live concerts across Japan called "Y's Song", visiting cities such as Yokohama and Nagoya from June 30 to July 5.