Martaza Lagoon (; ) is a small salty lagoon in the Tuzly Lagoons group in Bilhorod-Dnistrovskyi Raion of Odesa Oblast, Ukraine. It is separated from the Shahany Lagoon by the sandbar in its north part, near the village of Rybalske (old name - Martaza). The total area of the lagoon is 0.5 km<sup>2</sup>.
The water body is included to the Tuzly Lagoons National Nature Park.