Is the british empire biggest empire?

Yes, the British Empire was the largest empire in history. At its peak in the late 19th and early 20th centuries, the British Empire covered over 13 million square kilometers (5 million square miles) of land, which was about a quarter of the Earth's total land area. The British Empire included territories in North America, Africa, Asia, and Oceania. The British Empire was also the world's leading power in economics, politics, and culture during this time.