Lewisville Lake is a reservoir located in North Texas (USA) on the Elm Fork of the Trinity River in Denton County near Lewisville. The lake is primarily used recreationally for boating and watercraft, however, it was built for flood control purposes and to serve as a water source for Dallas and its suburbs.

It is generally murky with extremely low visibility. The water by the dam is clear with a visibility of 2 to 3 feet (~1 m).

The lake has many facilities for overnight camping and fishing—the black bass lake record was broken three times in 2006.

In 1991, the City of Denton installed a hydropower facility at Lewisville Dam. The single horizontal S-Shaped Kaplan unit is capable of producing 2893 kilowatts, and is connected to the grid via the Brazos River Distribution Authority.

The lake is very close to a large population base in the Dallas/Fort Worth Metroplex, so during the summer months, the lake can become extremely crowded. For a number of years Lewisville Lake was ranked the most dangerous lake in Texas due to the number of accidents and fatalities which occurred. Most of the fatalities are from individuals enjoying the day at the many parks around the lake and going too far out in the water. The number of actual boating accidents on the lake is fairly low. Adding to the danger for boats and other recreational watercraft, the lake contains numerous shallow areas with exposed and submerged trunks and other water hazards. Other recreation around the lake also includes a few areas for public hunting of water fowl and feral hogs (archery only).

On the lake, there are five marinas: Eagle Point Marina, Pier 121, Cottonwood Creek Marina, Dallas Cornthian Yacht Club, and Lakeview Marina, and two restaurant/bars: Sneaky Pete's and Charlie's. Charlie's has a nice outdoor patio on the water but the service can be an issue along with long delays on food orders (small Kitchen). In addition, Charlie's is more of a seasonal place, closed from January through early March.

Party Cove located in near the old dam is home to the weekend revelers.

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