Diablo IV is a 2023 action role-playing game developed and published by Blizzard Entertainment. It is the fourth main installment in the Diablo series. Announced at BlizzCon 2019, the game was released on June 5, 2023 for the PlayStation 4 and PlayStation 5, Xbox One and Xbox Series X and S, and Microsoft Windows. Players create a character from one of eight playable classes—Barbarian, Sorcerer, Druid, Rogue, Necromancer, Spiritborn, Paladin, or Warlock—and use their skills to complete quests through combat.

Staple features returned from previous installments in the franchise, such as a focus on replayable, procedurally generated dungeons and loot-focused character-building, while also featuring mechanics new to the series, including an open world and player versus player combat.

Diablo IV received generally positive reviews from critics, who praised the game's narrative and atmosphere. As of September 2024, it has surpassed one billion dollars in total revenue. Its first expansion, Vessel of Hatred, was released in October 2024. The current season, Season 12: Season Slaughter, started on March 1, 2026 and will lead directly into the release of the second expansion, Lord of Hatred, announced in December 2025 and will release April 28, 2026.

The core formula for the series' gameplay revolves around gradually obtaining stronger equipment by defeating increasingly difficult enemies. Enemies are fought using different character class skills which can be customized by equipment and talent trees. This concept is used to progress through the story and quests. Enemies are split into monster families which are defined by a theme, combat style, and their location. Each family contains different archetypes that hold different roles allowing for synergies of specialty abilities between family members. To differentiate between them, they have unique silhouettes, stances and weapons.

Creative director Sebastian Stepien explained that the goal was to create a more "grounded" story than Diablo III. In order to achieve this, the plot revolves around the simple folk of Sanctuary rather than "politics, kings, or another high-fantasy theme."

The playable character's effectiveness in combat is determined by their attributes and their boosts from equipped items. Offensive attributes include attack and critical chance which increase damage output. Defensive stats include elemental resistance and defense which increase how much damage can be taken. Diablo IV introduces three new attributes: Angelic, Demonic, and Ancestral Power. Angelic and Demonic Power alter the duration of beneficial and negative effects respectively. Ancestral Power increases the chance of effects being applied to another entity. Weapons and gear have increasing rarity which are a general indicator of their power. The rarest items have unique effects that alter more than just the character's parameters. In an interview with lead game designer Joe Shely and senior producer Tiffany Wat, it was revealed that trading and crafting will be available in the game but will be limited to resources outside of the most powerful items. Limited-time seasons return to the game, which add "season-specific" items, characters, events and content to keep the game fresh for players to enjoy.

Microtransactions are included in the form of cosmetic items. The game cannot be played offline and requires an internet connection.

The player's viewpoint is an overhead isometric view, as opposed to third person or first person view.