Royal Poinciana Way Historic District, Historic district in Palm Beach, United States.

Royal Poinciana Way Historic District is a historic commerce and residential district in Palm Beach, Florida, bounded by 207 to 283 Royal Poinciana Way, 95-118 North County Road and 184-280 Sunset Avenue. It holds 36 buildings, 26 of them contributing properties, built between 1915 and 1954 by 12 architects including Martin L. Hampton, William Manly King and Gustav Maass.

The district was originally called Main Street and became Palm Beach's commercial center after a combined rail and pedestrian bridge opened in 1901, the only direct route into town until 1911. Its oldest contributing buildings date from 1915–1919, and most others were built through the 1920s land boom and after World War II. In 1937 Main Street was renamed Royal Poinciana Way, and the Flagler Memorial Bridge opened in 1938. The district was listed on the National Register of Historic Places on September 17, 2015.

The district displays architecture spanning multiple periods and styles that together shape the face of Palm Beach's historic center. Visitors see buildings that emerged over four decades, reflecting different tastes and approaches to design.

The district lies between two main streets and is easy to explore on foot since it is flat and compact. Most shops and restaurants are accessible from street level, and the historic post office marks a recognizable landmark for visitors.

The Campbell Building at 277-283 Royal Poinciana Way, built in 1918, held Palm Beach's post office, a grocery store and other shops on its ground floor, while the second floor had a dance floor, a casino and a restaurant. It stands at the northeast corner of Royal Poinciana Way and Bradley Place.