Honglou, National cultural heritage building in Jingshan Subdistrict, China.

Honglou is a four-story red-brick building completed in 1918 on Wusi Dajie, with a basement and an H-shaped plan: 100 m wide, 14 m deep in the main block, wings 34.34 m long, 10,000 m² total. The basement held a printing shop, the first floor the Peking University library, the second floor classrooms and the president's office, and the third and fourth floors classrooms.

The structure was built in 1918 as part of Peking University during a transformative period in Chinese history. It became a significant location in the early development of China's modern political movements.

The name Honglou comes from the red bricks of its facade. On the eve of 4 May 1919, the New Tide Society, a student group given space by Li Dazhao, made over 3,000 flags and banners here; Luo Jialun drafted the 'Beijing All-Students' Manifesto' at a desk, and 20,000 copies were printed before the march.

The building stands at 29 Wusi Dajie in Dongcheng, on the north side of the street facing the old campus grounds. The museum entrance is on the ground floor, where six restored rooms and two thematic displays occupy about 3,000 square metres; the upper floors are reached by stairs. Allow time for the separate 180-square-metre exhibition hall in the courtyard behind.

The New Tide Society room on the ground floor recreates the student club where, on the eve of 4 May 1919, Luo Jialun drafted the "Beijing All-Students' Proclamation" at a desk. Some 3,000 flags and banners were made there, and 20,000 copies of the proclamation were printed before the march—the only printed material distributed that day.