Abbey of Saint-Acheul, Augustinian abbey in Saint-Acheul district, Amiens, France.

The Abbey of Saint-Acheul is a former monastery of Augustinian canons in the Saint-Acheul district of Amiens. Its abbey church, rebuilt in the Jesuit style in the second half of the 18th century, has a facade with two tiers of pilasters under a triangular pediment, and a single nave spanning 43 by 10 metres. The convent buildings, dating to the 18th century, include a brick-and-stone pavilion in the south wing.

Bishop Rorico founded the monastery in 1085 as a religious community serving Amiens and surrounding lands. The French Revolution brought its monastic life to an end in 1790, transforming the site's purpose.

The church preserves the memory of Saint Firmin, the first Bishop of Amiens, through carved stone reliefs from the 15th century depicting scenes from his life. These artworks allow visitors to follow the saint's story directly on the walls.

The former monastery buildings now house a private secondary school, while the church itself remains open to visitors as a functioning parish church. Before visiting, check opening hours as the site may have restricted access times for the crypt and main church spaces.

The crypt was discovered by chance in 1697 during altar work, revealing multiple ancient sarcophagi arranged within its stone walls. Local monks identified one as the tomb of Saint Firmin, which brought pilgrims seeking connection to the early saint.