Anton Wulff House, Historic residence in King William District, San Antonio, US.

The Anton Wulff House is a two-story Italianate limestone house at 107 King William Street, built 1869–1870. Its rough-cut tan stone facade has a tall narrow gable with a round medallion near the top, and a double-tiered veranda with dark green wooden posts: three round-arched openings and a green balustrade above, rectangular openings and a wider balustrade below. A flat-roofed stone wing with a dark double door stands to the right.

German immigrant Anton Wulff built this residence between 1869 and 1870 on land that once belonged to the San Antonio de Valero Mission. The location connects the property to the city's Spanish colonial heritage and early development.

The round medallion near the top of the front gable is a detail visitors can spot from the street; the sources do not record whom or what it depicts. The house was the headquarters of the San Antonio Conservation Society from 1975 to 2022. An adjacent lot is named the Pedro Huizar Garden, after the original landowner.

The house stands at 107 King William Street in the King William Historic District; it served as the San Antonio Conservation Society headquarters from 1975 to 2022 and is not open as a house museum, so visitors view the limestone facade and double-tiered veranda from the street and sidewalk. The Pedro Huizar Garden, named for the original landowner, sits on the adjacent lot.

Anton Wulff, who commissioned the house, was declared a spy by Confederate Lt. Colonel John Baylor during the Civil War for supplying military units on both sides; he sent his family to Germany and waited out the war in Mexico. In gratitude for his privately funded beautification of Alamo Plaza, city business leaders gave him an engraved gold-topped walking cane.