Krithini kouloura refers to a traditional Greek barley rusk, primarily associated with the island of Kalymnos. It is a hard, round bread made from barley, often softened with water and used as the base for various local dishes, particularly salads.

The most common dish featuring krithini kouloura is the Kalymnian salad Mermizeli, where the softened rusk is combined with tomatoes, onions, cheese (typically feta or cream cheese), and plenty of olive oil. Originally, this bread was made for sailors, as it could last a long time without spoiling, making it ideal for long voyages.