Walter William Ahlschlager (July 19, 1887 – March 28, 1965) was a 20th-century American architect. After being located in Chicago for many years, he established his office in Dallas, Texas in 1940. He died in Dallas.
- Davis Theater, Chicago, Illinois (1918)
- Sovereign Hotel, Edgewater, Chicago (1920)
- Sheridan Plaza Hotel, Uptown, Chicago, Illinois (1921)
- Peabody Hotel, Memphis, Tennessee (1926)
- Uptown Broadway Building, Uptown, Chicago, Illinois (1926)
- The fieldhouses at several Chicago public parks, including Riis Park, Simons Park and Kelvyn Park
- Roxy Theatre, New York City (1927)
- Medinah Athletic Club (Chicago, Illinois) InterContinental Chicago, Downtown Chicago, (1929)
- Beacon Hotel and Theatre, New York City (1929)
- Carew Tower, Cincinnati, Ohio (1930)
- City Place Tower, Oklahoma City, Oklahoma (1931)
- Mercantile National Bank Building, Dallas, Texas (1943)
- Wichita Plaza Building, Wichita, Kansas (1962)
Ahlschlager was born to German Jews John and Louise Ahlschlager and had one sister named Ella. John Ahlschlager and his brother, Fred, were both "prominent local [Chicago] architects."