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Bay St. Louis is a city in and the county seat of Hancock County, Mississippi, in the United States. Located on the Gulf Coast on the west side of the Bay of St. Louis, it is part of the Gulfport–Biloxi Metropolitan Statistical Area. As of 2010, Bay St. Louis’ population was 9,260.

Hollywood Casino Gulf Coast (formerly Casino Magic Bay St. Louis) is a casino hotel complex in Bay St. Louis, Mississippi, owned by Gaming and Leisure Properties and operated by Penn Entertainment.

Bay St. Louis station is a closed Amtrak intercity train station in Bay St. Louis, Mississippi, which served the Sunset Limited. The Bay St. Louis station consists of two small platforms with indoor/outdoor shelters near the former Louisville & Nashville Railroad Depot, which was built in 1929, but is closed to the public. Former Louisville & Nashville services which utilized their station included the Pan-American, Gulf Wind, and Humming Bird. Into the latter 1960s the Southern Railway's Crescent and Piedmont Limited also used this station. Amtrak service began with the Gulf Coast Limited, which operated between 1984 and 1985 and called at the station. The stop was reactivated on March 31, 1993 in service on the Sunset Limited. Damage to the rail line resulting from Hurricane Katrina in 2005 caused Amtrak to suspend service east of New Orleans, including at Bay St. Louis. In anticipation of restored service, Amtrak began construction of a new Americans With Disabilities Act-compliant platform in 2022.

The Alice Moseley Folk Art and Antique Museum is a museum in Bay St. Louis, Mississippi. The museum is dedicated to increasing understanding of the folk artist and painter Alice Moseley. The museum was opened in the Blue House, the place of Moseley's last residence, by Moseley's son Tim shortly after her death. The museum moved to the historic Bay St. Louis Railroad Depot, across the street from the Blue House, and was re-opened in March 2013. Admission to the museum is free.

Our Lady Academy (OLA) is a private, Roman Catholic, all-girls high school in Bay St. Louis, Mississippi. It is located in the Roman Catholic Diocese of Biloxi. It is the only all-female Catholic school in Mississippi.

St. Stanislaus College (SSC) is a Catholic day and boarding school for boys in grades 7–12. It has been owned and operated by the Brothers of the Sacred Heart order since 1854. It is located about an hour's drive outside New Orleans in Bay Saint Louis, Mississippi. The institution is named after Saint Stanislaus Kostka, who is the Patron Saint of youth, young students, and seminarians. It takes in day and boarding students from grades 7-12. It was founded in 1854 by the Brothers of the Sacred Heart. The school mascot is the "Rock-A-Chaw."

The Bay of St. Louis (St. Louis Bay; French: Baie Saint-Louis) is a shallow-water, partially enclosed estuary of the northeast Gulf of Mexico along the southwestern coast of Mississippi. The estuary receives freshwater input from one blackwater, or swamp-land, the Jourdan River on the west and the Wolf River on the east and some smaller streams (Bayou Portage); these are mixed in the bay with salt water from Mississippi Sound and the Mississippi Bight. The waters are comparatively well mixed, with an average salinity of less than 20.The Bay of St. Louis is classified as an "impaired" waterway by the United States Environmental Protection Agency due to high fecal coliform levels in the waters from urban development on the bay and surrounding waters.

The St. Louis Bay Bridge is a bridge in the U.S. state of Mississippi which carries U.S. Route 90 over Bay of Saint Louis between Bay St. Louis and Pass Christian. The original bridge was heavily damaged by Hurricane Katrina in August 2005. The new bridge opened to traffic on May 17, 2007. The span carries 4 lanes of traffic as well as a 12-foot (3.7 m) path for pedestrians and bicyclists on the Gulf side of the bridge.

Waveland is a city located in Hancock County, Mississippi, United States, on the Gulf of Mexico. It is part of the Gulfport–Biloxi, Mississippi Metropolitan Statistical Area. The city of Waveland was incorporated in 1972. As of the 2010 census, the city had a population of 6,435. Waveland was nearly destroyed by Hurricane Camille on August 17, 1969, and by Hurricane Katrina on August 29, 2005. The current mayor of Waveland is Jay Trapani.

WQRZ-LP (103.5 FM) is non-commercial low-power FM community radio station licensed to Bay Saint Louis, Mississippi, United States. The station is currently owned by the Hancock County Amateur Radio Association.

Shoreline Park is a former census-designated place (CDP) in Hancock County, Mississippi. It is part of the Gulfport–Biloxi, Mississippi Metropolitan Statistical Area. The population was 4,058 at the 2000 census. It was not included in the 2010 census. The area is now largely within the city limits of Bay St. Louis, although some of the western side of the former CDP is still unincorporated after Hurricane Katrina in 2005.

Diamondhead is a city in southeastern Hancock County, Mississippi, United States. The city is located just over 50 miles (80 km) northeast of New Orleans, Louisiana. It is part of the Gulfport−Biloxi Metropolitan Statistical Area. In February 2012, Diamondhead was officially incorporated as a city. In the 2020 USA decennial census, the city population was 9,529.