World Turkic Language Family Day

World Turkic Language Family Day (UNESCO)

Zamenhof Day

Zamenhof Day (International Esperanto Community)

Koninkrijksdag

Kingdom Day (Netherlands), moves to December 16 if the 15th is on a Sunday

German occupation of the Channel Islands

Homecoming Day (Alderney)

December 15 (Eastern Orthodox liturgics)

Christian feast day:
December 15 (Eastern Orthodox liturgics)

Virginia Centurione Bracelli

Christian feast day:
Virginia Centurione Bracelli

Valerian of Abbenza

Christian feast day:
Valerian of Abbenza

Mesmin

Christian feast day:
Mesmin

Maria Crocifissa di Rosa

Christian feast day:
Maria Crocifissa di Rosa

John Horden

Christian feast day:
John Horden and Robert McDonald (Episcopal Church (USA))

Drostan

Christian feast day:
Drostan (Aberdeen Breviary)

Blessed Martyrs of Drina

Christian feast day:
Drina Martyrs

2nd Amendment Day

Bill of Rights Day (United States)
2nd Amendment Day (South Carolina)

William J. Bauer

William J. Bauer, senior United States circuit judge of the United States Court of Appeals for the Seventh Circuit in Chicago and previously a United States district judge of the United States District Court for the Northern District of Illinois, (born 1926)

Zakir Hussain (musician)

Zakir Hussain, Indian tabla player, musical producer, film actor and composer (born 1951)