Welwyn Garden City is a town in Hertfordshire, England, 20 miles (32 km) north of London. It was the second garden city in England and one of the first new towns. It is unique in being both a garden city and a new town and exemplifies the physical, social and cultural planning ideals of the periods in which it was built.

Sir Ebenezer Howard was an English urban planner and founder of the garden city movement, known for his publication To-Morrow: A Peaceful Path to Real Reform (1898), the description of a utopian city in which people live harmoniously together with nature. The publication resulted in the founding of the garden city movement, and the building of the first garden city, Letchworth Garden City, commenced in 1903.