The Experience + Innocence Tour (styled as eXPERIENCE + iNNOCENCE Tour) was a worldwide concert tour by the Irish rock band U2. Staged in support of the band's 2017 album, Songs of Experience, the tour visited arenas throughout 2018. Comprising two legs and 60 concerts, the Experience + Innocence Tour visited North America from May through July, and Europe from August through November. It began on 2 May 2018 in Tulsa, Oklahoma, and ended on 13 November 2018 in Berlin, Germany. The tour followed U2's 2015 Innocence + Experience Tour as the second in a pair of tours in support of the group's companion albums, Songs of Innocence (2014) and Songs of Experience.

The 2018 tour reprised the loose autobiographical narrative from the 2015 tour, along with the original's multifaceted stage comprising a rectangular main stage, circular B-stage, connecting walkway, and doubled-sided LED video screen with an interior walkway. Several enhancements were made to the set, such as a higher resolution and more transparent video screen and the addition of LED panels to the B-stage floor. The band incorporated augmented reality into the tour, building it into a mobile app for fans to use, as well as using it to revive lead vocalist Bono's demonic stage character "MacPhisto" from the Zoo TV Tour in 1993. During the Experience + Innocence Tour, the group performed their oft-requested 1991 song "Acrobat" for the first time in their career, and they focused setlists on their Songs of Experience and Innocence albums. Having toured in 2017 to commemorate the 30th anniversary of The Joshua Tree, the band decided not to perform any songs from that record on the Experience + Innocence Tour, leaving out some of their most well-known tracks.

Ticket purchases for the Experience + Innocence Tour included copies of Songs of Experience, helping the album reach number one on the US Billboard 200. The tour made use of Ticketmaster's "Verified Fan" platform in an attempt to combat ticket scalping, making U2 the first group to do so for an arena tour. The Experience + Innocence Tour received positive reviews and grossed $126.2 million from 923,733 tickets sold.

In 2014, U2 released their thirteenth studio album, Songs of Innocence, which they supported with the Innocence + Experience Tour in 2015. The group originally began it with the intent to tour in two phases, one with material primarily taken from Songs of Innocence and one with material that would eventually be from its follow-up, the companion album Songs of Experience. However, slow progress on the Experience record delayed the second tour. Bassist Adam Clayton said, "By the time we finished the Innocence tour and came full circle to focus on the [Songs of Experience] album, it was clear we weren't going to be able to flip it really quickly into the Experience side of the material and put it right back out on tour." When asked in 2017 about plans to continue the Innocence + Experience Tour, guitarist the Edge said, "We feel like that tour wasn't finished. So right now, we'd love to finish that tour. I would imagine it's gonna be with very similar production components... But we like that tour and that project wasn't completed. It is still alive in our minds creatively."

Several other factors contributed to a delay. Due to the shift of global politics in a conservative direction, highlighted by the United Kingdom's Brexit referendum and the 2016 US presidential election, the band decided to delay Songs of Experience from its planned release in the fourth quarter of 2016 to reassess its tone and whether it was still communicating what they wanted it to. The group also committed to a 2017 concert tour to commemorate the 30th anniversary of their album The Joshua Tree. Furthermore, lead vocalist Bono suffered what he referred to as a "brush with mortality" shortly after Christmas 2016, further affecting the direction of Songs of Experience.

Both the 2015 and 2018 tours were structured around a loose autobiographical narrative about U2, grounded in the story of the death of Bono's mother and the violence of the Troubles that shaped the band members' youths in Ireland. Whereas Songs of Innocence explicitly revisits memories of their adolescence, Songs of Experience took "a more macro narrative stance, almost as if the narrator is writing from beyond life", according to tour designer Es Devlin. Accordingly, the narrative for the 2018 tour was reframed, using the lyric "Now you're at the other end of the telescope" from the Experience song "Love Is All We Have Left" as a guiding principle. Bono said the group intended the 2018 tour to be "less self-indulgent" and wanted to stay current by incorporating new technology and audience interaction into the production.

Production Resource Group (PRG), which has been involved in each U2 tour since 1992, began planning the Experience + Innocence Tour in September 2017. The firm started by trying to solve the weight problem from the original tour, an issue further complicated by the band's request to make the LED screens higher resolution, more transparent, and able to support an augmented reality (AR) element. The firm re-thought how to design an LED screen and devised a new system called Pure10.

The tour reprised the same multi-faceted stage setup from the Innocence + Experience Tour. At one end of the venue was the rectangular main stage, which measured 19.4 metres (64 ft) wide by 10.8 metres (35 ft) deep. At the opposite end was a circular B-stage, which measured 7.3 metres (24 ft) in diameter. Connecting the two stages was a 36.5-metre-long (120 ft) walkway. Suspended above it was a double-sided LED screen with an interior walkway, called the "barricage", which measured 29 metres (95 ft) long by 7 metres (23 ft) high.