Heroes of Might and Magic IV é um jogo de estratégia baseado em turnos desenvolvido por Gus Smedstad através da New World Computing e publicado pela 3do Company para computadores pessoais baseados no Microsoft Windows em 2002. A quarta parte da popular franquia Heroes of Might and Magic, é a sequência de Heroes of Might and Magic III, e foi a última a ser desenvolvida pela New World Computing.

Após os eventos de Heroes Chronicles: The Sword of Frost, Gelu, o líder da Guarda Florestal de AvLee e portador da Lâmina do Armagedom, ataca Kilgor, o Rei Bárbaro de Krewlod, na tentativa de reivindicar e destruir a Espada de Frost. Como predito por uma profecia, quando a Lâmina do Armagedom e a Espada do Gelo se chocam em batalha, o resultado é uma explosão maciça (conhecida como Reconhecimento), que destrói o mundo de Enroth. Muitos dos habitantes do planeta, no entanto, conseguem escapar através de portais misteriosos que aparecem durante o Cômputo que os levam a outro mundo, chamado Axeoth - também o cenário de Poder e Magia IX. Entre os refugiados estão muitos dos heróis das parcelas anteriores da série, e muitos retornam aos seus velhos hábitos logo após chegarem em sua nova casa. A história de Heroes of Might and Magic IV se desenrola principalmente através das seis campanhas do jogo, cada uma das quais estabelece como os principais reinos de um dos continentes de Axeoth foram forjados após o acerto de contas e a chegada dos refugiados Enrothianos em Axeoth. Cada uma das campanhas se concentra em um líder de facção e conta a história de como esse líder ganhou destaque. Ao contrário de Heroes of Might and Magic III, todas as seis campanhas são acessíveis desde o início, e cada uma se desenrola como uma história independente. Na campanha de Haven, A Lâmina Verdadeira, Lisandro, um cavaleiro leal anteriormente a serviço da Rainha Catarina Punho de Ferro, governa o reino nascente de Palaedra, habitado principalmente por refugiados do reino de Erathia. His command, however, is challenged by a usurper named Sir Worton, who claims to be the only surviving heir to the Gryphonheart dynasty. Many of Lysander's generals are drawn to Worton, forcing the lord to expose Worton as a fraud or lose control of his kingdom. At the start of the Stronghold campaign, Glory of Days Past, Waerjak, a barbarian chieftain, despairs over the changes that have come over the barbarian community. In the wake of Kilgor's death, his people have descended into interfactional strife, and are in danger of wiping themselves out. Intent on restoring the barbarian kingdom to its more peaceful state before Kilgor's ascension, Waerjak sets out to prove his strength and to subdue his rivals, guided by his mentor, Tarnum (previously the protagonist of the Heroes Chronicles series). The game's Academy campaign, The Price of Peace tells the story of Emilia Nighthaven, the peasant daughter of an Enrothian glassblower. On Axeoth, however, she finds herself taking command of a community of frightened refugees and forging them into the kingdom of Great Arcan. Queen Emilia's success, however, attracts the attention of Gavin Magnus, the Immortal King of Bracada from Heroes of Might and Magic III and Might and Magic VII, and his genie servant, Solmyr, who seek to prevent Axeoth from meeting the same fate as Enroth (i. e. being destroyed) by magically depriving its entire population of their free will. In the Preserve campaign, Elwin and Shaera, Elwin, a simple elf from the Elven kingdom of Aranorn (mainly populated by survivors from AvLee), is in love with Shaera, but their romance is threatened by Lord Harke, a powerful rival for Shaera's affection. Elwin's continued pursuit of his beloved plunges the region into internecine war, and whoever emerges the victor will not only win Shaera's hand in marriage, but the throne of Aranorn, as well. Half-Dead, the Necropolis campaign, relates the tale of Gauldoth Half-Dead, the half-human, half-lich victim of a necromantic spell that he cast to save his life which went horribly wrong. Tired of living on the scraps of food he can steal from fearful villagers, Gauldoth unites the forces of the surviving Necromancers and demonic Kreegans from Enroth's old kingdoms of Deyja and Eeofol into Nekross, a powerful and feared kingdom, but he is forced to act as a protector for both the living and the dead when a powerful being from another dimension arrives with plans to end all life in the universe. A Pirate's Daughter, the game's Asylum campaign, introduces the only daughter of a famous pirate, Tawni Balfour. Tawni inherits her father's ship and crew following his unfortunate death. Sailing down the coasts of the Gold Sea, fighting feared buccaneers, sea monsters and mermaids alike, Tawni intends to claim her father's mantle as Axeoth's most feared pirate captain, all while having to face her own shady past.