SID (also written as シド) is a Japanese rock band that formed as a visual kei band in 2003 and is signed to Sony and Danger Crue Records. They signed with Danger Crue Records after releasing their first demo CD in 2003. In January 2004, support members guitarist Shinji and drummer Yuuya became official members. Sid made an impact at the Anime Central convention in the United States, gaining international fans. Their first full album, "Renai," was released in 2005.

In 2006, Sid reached the Oricon top ten with their single "Chapter 1" and performed at Nippon Budokan. In 2008, they signed with Sony Records and released their debut major single, "Monokuro no Kiss," the opening theme for "Black Butler." Their debut concert at Nippon Budokan sold out in record time.

In 2009, they continued to make waves with hits like "Uso," the ending theme for "Fullmetal Alchemist: Brotherhood." Their first major album, "Hikari," dropped, along with singles like "One Way."

In 2010, Sid released the single "Sleep" in March and announced a performance at Saitama Super Arena in July. Their song "Rain (雨)" became the fifth opening theme and sixth ending theme for "Fullmetal Alchemist: Brotherhood." "Rain" marked Sid's first number one on the Oricon Daily charts. They also released a new single titled "Cosmetic" in September and performed at Tokyo Dome in December. In December 2010, they released "Ranbu no Melody" (乱舞のメロディ), which served as the 13th opening theme song for "Bleach."

Sid received the Top Pop Artist Award at the Billboard Japan Music Awards 2010 in February 2011. They also participated in Kuroyume's tribute album and released a DVD with footage from their live shows. Their new single, "Itsuka," reached No. 1 on the daily charts. Sid continued to release singles and DVDs in the following years, including "Fuyu no Bench" in December 2011.

In 2012, Sid performed in Singapore for the first time at the Music Matters Live 2013 event. They released their new single "Summer Lover" in July 2013. On May 24, 2013, Sid celebrated their 10th Anniversary at Yokohama Stadium. They continued to release singles and albums, such as "Enamel," which was used as the opening title in "Black Butler: Book of Circus."

In 2017, Sid created the new song "Rasen no Yume" (Spiral Dream) for the anime adaptation of "Altair: A Record of Battles." They released their first EP in 2018, "Ichiban Suki na Basho," followed by the album "Need of Approval" in 2019.

In 2021, Sid held their first online show amid the COVID-19 pandemic. In 2022, they composed an opening theme for "Heaven Official's Blessing." The band celebrated their 20th anniversary in 2023, releasing a comprehensive box set and officially sharing their music videos on YouTube.