Downtown Dallas is the central business district (CBD) of Dallas, Texas, United States, located in the geographic center of the city. It is the second-largest business district in the state of Texas. The area termed "Downtown" has traditionally been defined as bounded by the downtown freeway loop, bounded on the east by I-345 (although known and signed as the northern terminus of I-45 and the southern terminus of US 75 (Central Expressway), on the west by I-35E, on the south by I-30, and on the north by Woodall Rodgers Freeway.

The strong organic growth of Downtown Dallas since the early 2000s and continuing into the present has now resulted in Downtown Dallas, Inc.'s expansion of the term "Downtown" to include the explosive growth occurring immediately north of the Woodall Rodgers Freeway in the Victory Park and Uptown/Turtle Creek Districts, as well as past Central Expressway to the east in the Deep Ellum and Bryan Place Districts, past Interstate 30 to the south with the Cedars District, and jumping over Interstate 35E to the west to include the Design District and Lower Oak Lawn. In total, 15 districts now form "Downtown".

Downtown Dallas is now viewed as an interconnected grouping of dense and urban center city districts, that while unique in their own right, also share strong urban linkages to each other and collectively participate in their role as Downtown Dallas.

In 1910, Downtown Dallas was the location of a lynching of a black American man accused of raping a two-and-a-half-year-old white girl. A mob pulled him out of the Dallas County Courthouse and hanged him from a telephone pole.

On November 22, 1963, the assassination of John F. Kennedy occurred here. Both President Kennedy and Texas governor John Connally (who survived) were shot as their motorcade passed through Dealey Plaza in what is now the West End Historic District. Part of the former Texas School Book Depository is now the Sixth Floor Museum, with exhibits about Kennedy and the assassination. Nearby is the John Fitzgerald Kennedy Memorial.

The building boom of the 1970s and 1980s produced a distinctive contemporary profile for the downtown skyline influenced by nationally prominent architects. At the same time, the establishment of the West End Historic District in the 1980s preserved a very large group of late 19th-century brick warehouses that have been adapted for use as restaurants and shops.

With the construction of the Dallas Center for the Performing Arts in the Arts District of Downtown, Dallas will be the only city in the world that has four buildings within one contiguous block designed by four separate and distinguished Pritzker Architecture Prize winners.

Downtown Dallas has also gained more recent national attention for the 2016 shooting of police officers and the 2019 courthouse shooting.