Sikhism

Sikhism was a religion primarily associated with India. Its adherents were called Sikhs. They typically wore turbans, and grew their hair out long under them. (TV: Brave-ish Heart, For Tonight We Might Die, The Coach with the Dragon Tattoo)

Ram Singh and his father Varun were Sikhsm, but April MacLean noted that he wore short hair. (TV: Brave-ish Heart) While Varun wore a turban, (TV: For Tonight We Might Die, The Coach with the Dragon Tattoo, et al.) Ram quipped, "Ever try going through airport security with a turban?" (TV: Brave-ish Heart)

The taxi drivers who drove the Seventh Doctor and Ace from Heathrow Airport to Smithwood Manor were Sikhs. (PROSE: Cat's Cradle: Warhead)

Donna Noble's cousin Janice was married to a Sikh. (PROSE: Ghosts of India)

Ajeeth, servant of Lady Cornelia Basildon-Stone, was a Sikh. (COMIC: The Crystal Throne)