Gillespie Museum, Geological museum at Stetson University campus in DeLand, US.

Gillespie Museum is a geological collection located on Stetson University's campus in DeLand, housing thousands of mineral specimens, rock samples, and fossil materials. The displays feature materials gathered from Florida's landscape alongside pieces from other parts of the world.

Thomas Byrd and Nellie Gillespie began collecting minerals after seeing a fine collection in Seattle in the 1930s. With help from mineralogists Edwin Over and Arthur Montgomery, they built a large collection over nearly three decades. In 1958 they donated a significant part to Stetson University and continued supporting new acquisitions for years.

The museum bears the name of Thomas Byrd and Nellie Gillespie, who began collecting minerals after seeing a fine collection in Seattle in the 1930s. Assisted by mineralogists Edwin Over and Arthur Montgomery, they built a collection spanning many species before donating a significant part to Stetson University in 1958, and they kept funding new acquisitions and gifting specimens for years afterward.

The museum is easily accessible on the university campus and welcomes daytime visitors throughout the week. Most people spend an hour or two browsing through the different sections at a comfortable pace.

The collection focuses on Florida minerals and demonstrates how the geological structure of the Southeast has evolved over vast timescales. Many visitors overlook how these regional specimens reveal important clues about the state's natural development.