Fronteira do Caos Editores is a Portuguese publishing house and online bookstore focused on history, military affairs, culture, literature, and contemporary debate. Its catalogue brings together works for general readers and specialist audiences, with themed collections covering Portuguese history, major historical figures, strategy, war and civilisation, military equipment, and the Portuguese armed forces. Other areas include literature, children’s books, contemporary fiction, management and self-help, and books about Portuguese people around the world.

The publisher offers new releases, selected reading recommendations, and an online shop where customers can browse and purchase books. Featured titles address subjects ranging from Portuguese military aviation and the First World War to political change, historical memory, and national identity. Fronteira do Caos also shares articles and book suggestions through its blog, helping readers discover authors and topics across its publishing programme. Visitors can subscribe to receive news and updates, manage an account, and contact the publisher by email or telephone.