Harald Conrad Stilling (9 February 1815 – 29 November 1891) was a Danish architect who was active in Copenhagen during the Late Classical period of the mid-18th century.

He spent his first childhood years in his maternal grandfather's home and was then sent to school in Copenhagen before completing a mason's apprenticeship in 1933.

He spent the next few years working as a mason in the summer time and studying under Gustav Friedrich Hetsch both privately and at the Royal Danish Academy of Fine Art.

[1] Stilling's first independent works were for Georg Carstensen in Tivoli Gardens.

Stilling served as building inspector in Copenhagen in 1856–71 and city architect (stadsbygmester) from 1872–87.