Who holds the title as the current head of state of the UK?

The head of state in the UK is a hereditary position, meaning it's passed down through the royal family. For over seventy years, that position has been held by Queen Elizabeth II. She acceded to the throne in 1952, following the death of her father, King George VI. Now, while King George III and Queen Victoria were both significant monarchs in British history – George III during the American Revolution and Victoria during the height of the British Empire in the 19th century – they are no longer living. Winston Churchill, on the other hand, was a famous Prime Minister during World War II, not a monarch. The role of Prime Minister is different; they are the head of government, leading the political party in power, while the Queen is the head of state, a largely symbolic role representing the UK. So, the current head of state can only be Queen Elizabeth II.