The Source is the ninth studio album from Ayreon, a progressive metal/rock opera project by Dutch musician Arjen Anthony Lucassen, released on April 28, 2017.

As with every Ayreon album, it is a concept album with each character being portrayed by one singer. Unlike the previous album The Theory of Everything, it marks a return to science fiction and the Ayreon storyline; it acts, in particular, as a prequel to 01011001, making it the first album in the storyline's chronology. It's Lucassen's first album under his new label, Mascot Label Group.

In the typical style of the project, the album features several guest singers to portray the characters across the album; although Lucassen usually prefers to work only once with a same singer in Ayreon, he mostly cast returning performers for The Source, including James LaBrie (Dream Theater), Simone Simons (Epica), Floor Jansen (Nightwish), Hansi Kürsch (Blind Guardian), Tobias Sammet (Edguy, Avantasia), Tommy Karevik (Kamelot, Seventh Wonder), and Russell Allen (Symphony X), together with newcomers such as Tommy Rogers (Between the Buried and Me), for a total of eleven main vocalists.

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