The Moshir ad-Dowleh Mansion (Persian: عمارت مشیرالدوله) is a historical mansion in Tehran, Iran.

It belonged to the Qajar era politician Hassan Pirnia.

The Declaration of Constitution [fa] (Persian: فرمان مشروطیت [fa]) was written here by Mirza Nasrullah Khan, Hassan Pirnia's father, in 1906.

[1][2][3] Parts of movies like Hezar Dastan and The Chess Game of the Wind were filmed in this mansion.

[4][5] It was listed in the national heritage sites of Iran with the number 1899 on 2 August 1997.