Thirty Three (Russian: Тридцать три, romanized: Tridtsat tri) is a 1965 Soviet comedy film directed by Georgiy Daneliya.

Travkin, a kind and unassuming food chemist from a distant, rural Russian town, spends his time developing new carbonated soft drinks, and also sings in an amateur choir.

He is brought to Moscow as a medical phenomenon and studied by famous scientists; it is proclaimed that Travkin's 33rd tooth is unique, and may connect him to extraterrestrials from Mars.

Travkin struggles with his celebrity status, is briefly confined to a psychiatric institution due to the slander of a jealous man, and has to fend off gold digging women, sycophant men, and journalists.

The only respite he finds is in his roommate at a hotel, who is a friendly, earnest industrial diver on a holiday.