Ratnapura (Sinhala: රත්නපුර දිස්ත්‍රික්කය, Tamil: இரத்தினபுரம் மாவட்டம்) is a district of Sri Lanka in the Sabaragamuwa Province.

This gem-mining centre of Sri Lanka is also a major crossroad between southern plains and the hill country to the east.

Excursions include Sinharaja Forest Reserve and Udawalawe National Park.

The surrounding area is a popular trekking destination and a good place for bird watching.

The district is home to Kukulugala, the 18th tallest mountain in Sri Lanka.