The Fayetteville Historic Square (usually shortened to Fayetteville Square or just The Square), in Fayetteville, Arkansas, includes the original Fayetteville post office, the Old Bank of Fayetteville Building, the Lewis Brothers Building, the Mrs. Young Building, and the Guisinger Building. These buildings are listed in the National Register of Historic Places. There are several more recent buildings located on the Square.

The historic district is defined by Center Street on the north, Mountain Street to the south, Block Avenue to the west and East Avenue to the east. The block within these one-way streets contains the Old Post Office, and formerly, the County Courthouse.

The Old Post Office, built in 1911, is the centerpiece of the Historic Square. The lot contained the Washington County Courthouse until 1905, when a new structure was built 1½ blocks away. The building has been renovated and now serves as a restaurant, Cheers at the Old Post Office.

The Old Bank of Fayetteville Building, sometimes called the Eason Building, anchors the northwest corner of the Historic Square. Built in the Queen Anne and Romanesque revival styles, the building held the Bank of Fayetteville and First National Bank upon their merger in 1915. The modern Bank of Fayetteville, located across the street in the Lewis Brothers Building, was founded in 1980, and has no affiliation to the Bank of Fayetteville of the 1915 merger.

The Lewis Brother Building located directly south of the Old Bank Of Fayetteville Building was constructed in 1908. Built in the Queen Anne and Classic revival styles, the building housed the Lewis Brothers Hardware Store from 1912. The hardware store has since closed, and the building now contains the main branch of the modern Bank of Fayetteville ( founded circa 1980, and unaffiliated with the original Bank of Fayetteville ). The brick exterior of the building was filmed in the television program Evening Shade.

The Mrs. Young Building, built in the Italianate style in 1887, is one of the older building on the Square according to National Register of Historic Places information.

Mrs. Young and her husband came from Illinois in the 1870s. She was a photographer, and her husband was a travelling dental surgeon. She purchased a lot for a home in 1881. After receiving a divorce in 1883, Mrs. Young built a two-story studio on the town square in 1887. The second floor was home to her photography studio. The first floor was, at various times, a grocery and a bank. With the money from her business plus the rent, she was able to retire.

The Guisinger Building is located in the southeast corner of the Fayetteville Historic Square. Built in 1886, the building consists of brick walls, a marble base, and pressed tin ceilings. It was constructed by William Crenshaw, a Fayetteville native in the hardware business. Now housing a law firm, the building was recently remodeled.

The University of Arkansas Global Campus offices are located on the northeast corner of the square. The East Square Plaza constitutes the east side of the Square. The east half of the south edge of the Square hosts the Fayetteville Town Center. The building was constructed in 2001

Two blocks west of the Square on Mountain Street is the Fayetteville Public Library (Blair Library).

Parking is free for any consecutive two hours within a four-hour time period, despite nearby Dickson Street's 2010 change to pay parking. Nearby pay lots are available for Square patrons who plan on staying over two hours.

• The Fayetteville Farmers’ Market - Saturdays April–November, includes around 60 vendors selling a wide variety of locally-grown flowers, produce, meats, eggs, baked goods, plants and arts and crafts.
• Lights of the Ozarks - November–January Fayetteville Parks and Recreation workers spend over 3,300 hours decorating the Downtown Square with over 400,000 lights.
• First Thursday - On the first Thursday of the month, the city's historic downtown square transforms into an outdoor arts district featuring visual artists who create items in a variety of mediums.
• Trick or Treat on the Square - On October 31 trick-or-treaters and their families can visit booths by business owners on the square and representatives from city departments to trick or treat.
• Fayetteville Film Fest - Hosted each October for films and filmmakers entering the marketplace, the festival includes full, 3-day schedule of panels and other events designed to complement nearly 80 film screenings.
• Block Street Block Party - Every May, Block Street Avenue turns into a local party. With 5 outdoor beer gardens, over 60 local bands and 150 vendors.

• Dickson Street, Commercial Historic District a few blocks from the Fayetteville Square
• Washington County Courthouse, built in 1905 very close to the Fayetteville Square
• Old Washington County Jail, built in 1896 one block from the Fayetteville Square
• Maxine's Tap Room, located north of the square on Block Avenue
• National Register of Historic Places listings in Washington County, Arkansas

• Historic Downtown Square Renovation page
• Flyer Detailing the 2008 Renovation
• Fayetteville Square Gardens
• Fayetteville Town Center on the Fayetteville Historic Square