Captain Alatriste (Spanish: El capitán Alatriste, fully titled Las aventuras del capitán Alatriste) is a series of novels by Spanish author Arturo Pérez-Reverte. It deals with the adventures of the title character, a Spanish soldier and man of fortune living in the 17th century.

As of December 2006, the book sleeve of Corsarios de Levante suggested that the novels El puente de los asesinos, La venganza de Alquézar and Misión en París were planned. As of October 2025^[update], El puente de los asesinos and Misión en París are already published in Spanish.

A movie based on the series, titled Alatriste, was released on September 1, 2006, directed by Agustín Díaz Yanes and starring Viggo Mortensen.

Pérez-Reverte was inspired to begin the series due to a lack of treatment in his teenage daughter Carlota's school textbook of the historical Spanish Golden Age. He commissioned Carlota to gather documentation for him (hence, she is billed as co-author of the first novel) and developed the stories. Pérez-Reverte is influenced by the works of many novelists, in particular 19th-century writers like Alexandre Dumas and his D'Artagnan Romances. He also applies the dark tone of his experiences as a war reporter.

The period settings allow him to insert references to authors (such as Lope de Vega and Miguel de Cervantes) and artists (including Diego Velázquez) who were widely read and appreciated at the time, one of the most important periods in Spanish history. He reflects on Spain and the Spaniards as a united people who, in spite of being at war with all the major European powers, are capable of showing bravery and honour.

In 2014, Telecinco produced the TV series Alatriste, directed by Enrique Urbizu and starring Aitor Luna.