The Sikkimese celebrate all major Hindu festivals such as Diwali and Dussera. Nepali festivals like Tihar and Bhimsen Puja are common. Losar, Loosong, Saga Dawa, Lhabab Duechen, Drupka Teshi and Bhumchu are Buddhist festivals. During the Losar (Tibetan New Year) most offices and educational institutions are closed for a week. Muslims celebrate Id-ul-fitr and Muharram. Christmas has also been promoted in Gangtok to attract tourists during the off-season.

Western rock music and Hindi songs have gained wide acceptance among the Sikkimese. Indigenous Nepali rock and Lepcha music are also popular. Common sports in Sikkim are Football and cricket. Hang gliding and river rafting have also been introduced in order to promote tourism.

Noodle-based dishes such as the thukpa, chowmein, thanthuk, fakthu, gyathuk and wonton are common in Sikkim. Momos, steamed dumplings filled with vegetable, buff (buffalo meat) or pork and served with a soup, are a popular snack. Beer, whiskey, rum and brandy are widely consumed. Sikkim has the third highest per capita alcoholism rate amongst all Indian states, behind Punjab and Haryana.