CA or ca may refer to:
Canada (; French: [kanadɑ]) is a country in the northern part of North America. Its ten provinces and three territories extend from the Atlantic to the Pacific and northward into the Arctic Ocean, covering 9.98 million square kilometres (3.85 million square miles), making it the world's second-largest country by total area and the fourth-largest country by land area.
California ( KAL-i-FORN-yə, KAL-i-FOR-nee-ə) is the most populous state in the United States and the third most extensive by area.
The Catholic Church, also known as the Roman Catholic Church, is the largest Christian denomination, with more than 1.29 billion members worldwide.
Camilla, Duchess of Cornwall, GCVO, CSM, PC (née Camilla Rosemary Shand, previously Parker Bowles; born 17 July 1947), is the second wife of Charles, Prince of Wales, the eldest child and heir apparent of Queen Elizabeth II.
The domestic cat (Latin: Felis catus) is a small, typically furry, carnivorous mammal. They are often called house cats when kept as indoor pets or simply cats when there is no need to distinguish them from other felids and felines.
Caitlyn Marie Jenner (born October 28, 1949), formerly known as Bruce Jenner, is an American television personality and retired Olympic gold medal-winning decathlete.
Catherine, Duchess of Cambridge (Catherine Elizabeth "Kate"; née Middleton; born 9 January 1982) is the wife of Prince William, Duke of Cambridge.
Cancer is a group of diseases involving abnormal cell growth with the potential to invade or spread to other parts of the body.