Conference Hall of the Senate, in March 1904 (Spanish: Salón de Conferencias del Senado, en marzo de 1904) is a painting by the Spanish artist Asterio Mañanós Martínez made in that same year.

[1] It is the first work that Mañanós would make as part of a series of six works on political life that make up his most interesting contribution to Spanish art.

[2] The painting, an oil on canvas measuring 92 x 142 cm, faithfully reproduces the Conference Hall, or Salón de los Pasos Perdidos, of the Palace of the Senate of Spain.

[2] In it are a series of politicians and personages of the time, as well as two of the actual paintings found in the room: The Oath to the Constitution (on the left) and The Surrender of Granada (on the right), the latter whose restoration Martinez had helped with.

[3] The painting itself is housed in the Palace of the Senate.