The Rivera expeditions were three trips conducted by Juan Maria de Rivera in the San Juan Mountains and on the Uncompaghre Plateau in southwest Colorado between 1765-1775. The purpose of these expeditions was to locate mineral deposits of gold and silver.

Rivera and his men were not helmented soldiers, but rather experienced traders; the group consisted of perhaps a half dozen men mounted on their best horses and leading pack mules.

Rivera spent several months prospecting along the San Juan River and its mountain tributaries. In the La Plata Mountains, he apparently found gold and silver. He crossed the La Platas to the Dolores River, and then headed north to the Gunnison River.

From an historical point of view, Rivera's expedition was marred by the fact that he apparently produced no map of his travels, and his diaries were not as informative as could be wished. However, two of Rivera's men later served as guides for the much better-documented Dominguez and Escalante expedition.