The Black Hills Flood of 1972, also known as the Rapid City Flood, was the most detrimental flood in South Dakota history, and one of the deadliest floods in U.S. history. The flood took place on June 9–10, 1972 in the Black Hills of Western South Dakota. 15 inches (380 mm) of rain in a small area over the Black Hills caused Rapid Creek and other waterways to overflow. Severe flooding of residential and commercial properties in Rapid City occurred when Canyon Lake Dam became clogged with debris and failed in the late evening hours of June 9 resulting in 238 deaths and 3,057 injuries. Over 1,335 homes and 5,000 automobiles were destroyed. The value of property damage was estimated to be over US$160 million in 1972 dollars. Flooding also occurred in Battle, Spring, Bear Butte, and Boxelder creeks.

Rapid Creek is a tributary of the Cheyenne River, approximately 86 mi (138 km) long, in South Dakota in the United States. The creek's name comes from the Sioux Indians of the area, for the many rapids in the stream.