Tirizis Island (Bulgarian: остров Тиризис, romanized: ostrov Tirizis, IPA: [ˈɔstrof tiˈrizis]) is the rocky island off the east coast of Robert Island in the South Shetland Islands, Antarctica extending 1.05 km in east-west direction and 350 m wide. It is ending in Kitchen Point to the east, and separated from the main island to the west by a 100 m wide passage formed as a result of glacier retreat in the late first decade of 21st century.
The feature is named after the ancient Thracian town of Tirizis in northeastern Bulgaria.