D.Gray-man Hallow (stylized as D.Gray-man HALLOW) is an anime series adapted from the Katsura Hoshino's manga, D.Gray-man. Produced by TMS Entertainment and 8PAN, and directed by Yoshiharu Ashino, it acts as a sequel to the previous D.Gray-man anime series and follows a young Exorcist named Allen Walker from the Black Order which are in charge of destroying weapons, known as Akuma, using objects known as "Innocence". The Akuma are created by an ancient sorcerer known as the Millennium Earl, who is allied with the immortal Noah Family. The plot focuses on Allen's connection with the Noah and his ally, Yu Kanda, who is planned to be used by them.

The series was announced at Shueisha's 2016 Jump Festa event. It aired in Japan from July 4, 2016, to September 26, 2016, having a total of 13 episodes. It was also broadcast on Animax Asia. On June 23, 2016, Funimation announced that they licensed Hallow and would stream it online. The English adaptation was also released by Funimation, and started on August 3, 2016.

In Japan, the episodes were originally meant to be collected in a total of six DVD and Blu-ray volumes. However, the home media release of Hallow was delayed in September 2016 to an unknown release date due to unmentioned reasons. In March 2017, the official D.Gray-man Hallow website stated the home media release was cancelled due to "various circumstances".

The music of the anime was composed by Kaoru Wada. The series's opening theme song is "Key -bring it on, my Destiny-" by Lenny code fiction, and the ending theme is "Lotus Pain" by Mashiro Ayano. The soundtrack of D.Gray-man Hallow was released on September 28, 2016. It includes 40 tracks.