Manga

That Time I Got Reincarnated as a Slime (転生したらスライムだった件) is a manga adaptation based on the light novels of the same name. In addition to the main story, there are also side-stories and spin-offs based on the series.

Main
The main manga is illustrated by Taiki Kawakami and debuted in Kodansha's Monthly Shōnen Sirius on March 26, 2015. The series is compiled into several tankōbon volumes, with the first volume released on October 30, 2015. Kodansha USA announced their license to the manga during their panel at New York Comic Con on October 6, 2016. They released the first volume in English on August 22, 2017.

Chapters Not Yet In a Volume

 * 64: The Difference in Class
 * 65: Megiddo
 * 65.5: A White Clover in a Place of Death
 * 66: Merciless
 * 67: Demon of Respect and Affection
 * 68: Birth of a Demon Lord
 * 69: ? - To Be Announced

The Ways of the Monster Nation
That Time I Got Reincarnated as a Slime: The Ways of the Monster Nation (転生したらスライムだった件～魔物の国の歩き方～) is a side-story manga by Shō Okagiri. The series has been serialized on Micro Magazine's Comic Ride website since July 28, 2016. The first volume was released on April 7, 2017. Yen Press announced it has licensed the series on January 6, 2020. The first English volume will be released in June 2020.

The Slime Diaries
The Slime Diaries: That Time I Got Reincarnated as a Slime (転スラ日記 転生したらスライムだった件), often shortened to Reincarnated Slime Diary (転スラ日記) or The Slime Diaries, is a 4-koma spin-off manga based on the main series. It is illustrated by Shiba and began serializing on Shonen Sirius. The first volume released on September 28, 2018. Kodansha USA announced its license to the manga during their panel at Anime Expo on July 6, 2019. They will release the first volume in English digitally on July 30, 2019.

That Time I Got Reincarnated as a Corporate Slave
That Time I Got Reincarnated as a Corporate Slave (転生しても社畜だった件) is a spin-off manga illustrated by Shizuku Akechi. It has been serialized in the Suiyōbi no Sirius web magazine since September 26, 2018, and it is also been serialized in print in Kodansha's Monthly Shōnen Sirius since October 26, 2018. The story centers on Rimuru, who re-awakens to the real world in a salaryman job similar to his previous life as Mikami, but still in his slime body.

Trinity in Tempest
That Time I Got Reincarnated as a Slime: Trinity in Tempest (転生したらスライムだった件 異聞 ～魔国暮らしのトリニティ～) is a spin-off manga illustrated by Tae Tono. It was first published on Monthly Shonen Sirus magazine's "Suiyōbi no Sirius." The manga centers on Phos, a girl from the Beast Kingdom of Eurazania. Phos, Stella, and Frey goes to Tempest on secret orders from Demon Lord Carrion. On March 18, 2020, Kodansha announced its license to the manga. They will release the first volume on October 20, 2020. Kodansha USA Announces Codename: Sailor V Eternal Edition, Ghost in the Shell: The Human Algorithm, Orient, More Manga for Print</ref

That Time I Got Reincarnated as Kosaku Shima
That Time I Got Reincarnated as Kosaku Shima (転生したら島耕作だった件) is a crossover spin-off manga written by Kenshi Hirokane and co-written by Fuse and Taiki Kawakami. It began serialization in Kodansha's Evening seinen manga in March 12, 2019. The manga is set in a parallel universe after Satoru Mikami dies, he gets reincarnated and awakens as 37-year old businessman Kosaku Shima instead of the slime monster, Rimuru Tempest.

Tenchura!
Tenchura! Tensei Shitara Slime Datta Ken (転ちゅら！ 転生したらスライムだった件) is a spin-off manga illustrated by Riku Akatsuki. The manga centers on Rimuru, after his encounter with Shizu, obtaining a human form. However, he instead turns into a three-year-old child.

Trivia

 * Out of the various manga adaptations, four are currently released on Monthly Shōnen Sirius.

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