The Diary is the debut studio album by the Dutch band The Gentle Storm, consisting of composer and guitarist Arjen Anthony Lucassen and singer and lyricist Anneke van Giersbergen. It was released on March 23, 2015 in Europe, and the following day in the US.

The Gentle Storm is a Dutch musical project by singer and lyricist Anneke van Giersbergen and composer and musician Arjen Anthony Lucassen, founder and leader of other musical projects such as Star One, Ayreon, Guilt Machine and Ambeon. The duo has previously collaborated in Ayreon albums Into the Electric Castle and 01011001. The project's debut album, The Diary, was released on March 23, 2015, in Europe, and the following day in the US.