Battleground (2015) was a professional wrestling pay-per-view (PPV) event produced by WWE. It took place on July 19, 2015, at the Scottrade Center in St. Louis, Missouri. It was the third event under the Battleground chronology. Battleground was available for free to new subscribers on WWE's monthly subscription service, the WWE Network in over 140 countries.

Seven matches were contested at the event, including one match on the pre-show. The main event between WWE World Heavyweight Champion Seth Rollins and Brock Lesnar ended in a disqualification, when The Undertaker made his unexpected return (and his first appearance on pay-per-view in WWE since WrestleMania 31) and attacked Lesnar. This was initially reported as a "no contest", but on the following night on Raw, Lilian Garcia announced that Brock Lesnar is the winner by disqualification, and Seth Rollins is still champion. The event received 76,000 buys (excluding WWE Network views), slightly down on the previous year's 99,000 buys.

Battleground comprised professional wrestling matches, involving wrestlers from pre-existing scripted feuds or storylines playing out on WWE's primary television programs, Raw and SmackDown. Wrestlers portrayed heroes or villains as they followed a series of events, building tensions and culminated in a wrestling match or series of matches.

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