Marktl, or often unofficially called Marktl am Inn ("little market on the River Inn"), is a village and historic market municipality in the state of Bavaria, Germany, near the Austrian border, in the Altötting district of Upper Bavaria.

The most notable neighbouring town is Altötting.

Marktl has approximately 2,800 inhabitants.

Marktl is the birthplace of Joseph Aloisius Ratzinger (1927–2022) otherwise known as Pope Benedict XVI.

Marktl's coat of arms features a ship's hook and caper measure as symbols of navigation and trade, under the blue and white lozenges of the duchy of Bavaria.