The Víctor M. Blanco Telescope, also known as the Blanco 4m, is a 4-metre aperture telescope located at the Cerro Tololo Inter-American Observatory, Chile on the summit of Mt.

[2][3][4] In 1995 it was dedicated and named in honour of Puerto Rican astronomer Víctor Manuel Blanco.

Currently the main research instrument used at the telescope is the Dark Energy Camera (DECam), the camera used in the Dark Energy Survey.

[6][7] The Mosaic II camera was used at this CTIO 4-m telescope in the southern hemisphere since 1999.

[8] This was a development of the KNPO Mosaic camera installed in 1998 in the northern hemisphere.