| Monument Name: | Monarch advertising sign |
| Native Name: | Letrero publicitario de Monarch |
| Location: | 51 Rancagua Street, Santiago,  Chile |
| Material: | Neon lighting |
| Extra: | 2169 |
The Monarch advertising sign (letrero publicitario de Monarch in Spanish) is a neon billboard located on the roof of a building at 51 Rancagua Street, in the Santiago Metropolitan Region of Santiago, Chile.
The sign was initially installed in 1954, and in 2010 was declared a National Monument of Chile. It is also classified as a Historical Monument.
The Luminosos Parragué company built and installed the Monarch advertising sign in 1955.
According to the general manager of the company, Claudio Parragué says:
Translation to English:
The Monarch advertising sign is made of neon lighting. It turns on every night; at 9:00 PM in the summer and at 6:00 PM in the winter.