Lake Jacomo /dʒəˈkoʊmoʊ/ is a 970-acre (3.9 km) freshwater reservoir located near Blue Springs in Jackson County, Missouri. It is located in the 7,809-acre (32 km) Fleming Park, which is managed by the Jackson County Parks and Recreation Association.

The idea for the lake began in 1932. The Presiding Judge of Jackson County, Harry S. Truman, requested that a study be done for a potential park. However, nothing was done at that time. It was 20 years later that local voters approved a bond issue to create and develop the lake. Lake Jacomo officially opened on May 30, 1959.

The lake's name is an acronym, from Jackson County, MO (Missouri), the county in which it is located.

Activities at Lake Jacomo include sailing, sailboat racing, pontoon boating, fishing, and hiking. Common fish found in the lake include crappie, bluegill, largemouth bass, carp, catfish, hybrid striped bass, green sunfish, and walleye.

Lake Jacomo has a marina open to the public year around. This marina is the largest boat rental marina in the Kansas City metropolitan area with more than 80 rentals available.

• Jackson County Parks and Recreation's Lake Jacomo web site
• 50th anniversary of Lake Jacomo
• Lake Jacomo Marina website