Glen Francis Brown (December 14, 1911 - February 27, 2001) was an American geologist at the U.S. Geological Survey who is best known for leading a years-long USGS effort to survey the geology, hydrology, and mineral resources of the Kingdom of Saudi Arabia, concurrent with most of the Arabian Peninsula. Brown was born in Graysville, Indiana and attended college at New Mexico School of Mines before receiving a master's degree and doctorate at Northwestern University. He began working with the USGS in 1938 and was posted to projects in different parts of the U.S. before being selected to explore water resources on the Arabian Peninsula, the result of a request by King Abdulaziz to the USGS. He undertook further explorations in Saudi Arabia on agricultural possibilities and geologic formations before completing his doctorate and being posted to Thailand for a geological and mineral reconnaissance. But in 1950, Brown was requested by King Abdulaziz to return to Saudi Arabia to lead an ambitious project, in conjunction with the Arabian-American Oil Company (Aramco), to survey the water and mineral resources of the entire kingdom. These maps would play a key role in the future economic and infrastructural development of the kingdom. Brown remained in Saudi Arabia for most of the following twenty years, leading the joint USGS-Saudi project until 1969, and remained a consultant residing in Jeddah until returning to the U.S. in 1972 and retiring, though remaining a key expert on Saudi Arabia's geology, geography, and tectonics.