On Your Mark is a song by the Japanese rock duo Chage & Aska. The song was released in 1994 as part of the single Heart. It became a million selling hit single upon its release and has been performed in concert by the duo. The song has been included on a variety of their albums. Originally written with Japanese lyrics an English language adaptation was created and released under the title Castles in the Air. It was notably performed by Chage and Aska during their recorded MTV Unplugged session, the first such session by an act from Asia.

In 1995 a music video was created by Studio Ghibli. Hayao Miyazaki wrote and directed the animated short film as a side-project after having writer's block with Princess Mononoke. The short film, with the title Ghibli Experimental Theater On Your Mark was played in concert in June 1995 and had a theatrical release in July together with Whisper of the Heart.

On Your Mark is an original song created and released by the Japanese duo Chage and Aska. The music and lyrics were written by Aska. The original lyrics were written in Japanese. The title is based on the sports term , a phrase used for the duo's 15th anniversary releases in 1994 and other promotional materials since then. The lyrics of the song were inspired by the lifestyle of the Japanese bubble economy. On August 3, 1994, the song was released as the third track on the Heart, Natural, On Your Mark Mini CD single for the Pony Canyon label. It reached number 1 on the Oricon Singles Chart upon its release. More than 1.1 million copies have been sold.

On Your Mark was used as the theme song for the 1994 ‘’American Festival’’. The 1994 Festival was an event held, to reinforce Japan-United States of America ties, marking the 150th anniversary of the Convention of Kanagawa establishing Japan–United States relations.

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