Sumo is the debut studio album by Australian alternative rock band the Superjesus, which was issued on 1 February 1998. It was produced and mixed by Matt Serletic for East West Records/Warner Music Australia and peaked at number 2 on the ARIA Albums Chart. The album was re-issued in October 1998 as Sumo II, with an additional disc of live performances. At the 1998 ARIA Music AwardsSumo won the inaugural Best Rock Album category. It was also nominated for Best Group, Breakthrough Artist – Album and Chris Tennent and William Tennent were nominated for Best Cover Art.
To celebrate 20 years since its release, Sumo was re-released in August 2018, with bonus tracks and on vinyl for the first time. The Superjesus toured the album during the second half of 2018.
Sumo was recorded by the Superjesus in Atlanta, Georgia from April 1997. Their debut five-track extended play, Eight Step Rail, was released in August 1996 via Aloha Records, two of its tracks are “Shut My Eyes” and “I’m Stained”. After touring with visiting British band, Bush in late 1996 and performing at the 1997 Big Day Out Festival, the Superjesus began work on the album. In an August 1997 interview with The Sydney Morning Herald, guitarist Chris Tennent stated, “We did the Bush tour and the Big Day Out. Then we took time out to get some songs together before recording the album.” In 2018, vocalist Sarah McLeod reflected, “we flew to Atlanta, Georgia to record our first full length record for our new label Warner. We chose Triclops Studios because that’s where the Smashing Pumpkins recorded our favourite record, Siamese Dream. Once it was in the can, we came back to Australia and were asked to play at the  ARIAs.”
Both “I’m Stained” and “Shut My Eyes” were re-recorded for Sumo, with “Shut My Eyes” as a hidden track. McLeod and Tennent were dating prior to recording the album, Tennent was “writing songs which he recorded, complete with all the guitar parts, onto a tape” and McLeod “spent a considerable time familiarising herself with the songs. She was still writing lyrics on the plane bound for Atlanta.” By the time it was released McLeod and Tennent’s personal relationship was over however they continued in the band. Two singles appeared ahead of the album, “Down Again” (August 1997) and “Saturation” (November). Its third single, “Now and Then” was issued in March 1998. The fourth single, “Ashes”, followed in September. The group provided a track-by-track description of the album for The iZine in February 1998. The Sumo Tour of Australia, with over 40 dates, occurred from mid-February to late April. They started the tour with an appearance on national youth radio Triple J‘s program Live at the Wireless in Sydney, where they recorded tracks live-in-the-studio.Sumo was released in the United States in July 1998 and the Superjesus relocated to Los Angeles to promote it. Upon return to Australia Tennent left the Superjesus and was replaced on guitar by Tim Henwood in July 1999.