Lake Worth Beach, previously named Lake Worth, is a city in east-central Palm Beach County, Florida, United States, located about 64 miles (103 km) north of Miami. The city's name is derived from the body of water along its eastern border known as the Lake Worth Lagoon, which was named for General William J.

The primary difference is that Lake Worth Beach is the official name of the city, while "Lake Worth" often refers to the actual body of water (the lagoon) or is the former name of the municipality. In 2019, the city of Lake Worth, Florida, officially voted to change its name to Lake Worth Beach to better market its coastal identity and distinguish itself from inland areas. Geographically, the "Lake Worth" lagoon is part of the Atlantic Intracoastal Waterway that separates the mainland from the barrier island. When people say "Lake Worth Beach," they are usually referring to the city's vibrant downtown area or the Lake Worth Beach Park, which features a historic casino building, a popular pier, and public beach access. In 2026, the name change is fully integrated into all local branding and mapping, but many long-time residents still colloquially refer to the town simply as "Lake Worth." Essentially, one is the "brand and city," while the other is the "water and history."