Atomic Heart is the fourth studio album by Japanese rock band Mr. Children, released in September 1994.

Their follow-up single "Innocent World", which was featured in the TV advertisement for Coca-Cola's sports drink Aquarius, came out in June 1994 and immediately went straight to the top on the chart.

Stimulated by those smash hit singles, Atomic Heart debuted at #1 on the Japanese albums chart with first-week sales of over 852,000 copies.

[1] On the 1994 year-end charts published by the Oricon, it is ranked at the third best-selling album of that year with sales of 1.7 million copies.

Along with its lead single "Innocent World", Atomic Heart won the 36th Japan Record Awards on New Year's Eve of 1994.