| Unit Name: | 183rd Mixed Brigade |
| Native Name: | 183.ª Brigada Mixta |
| Dates: | February - October 1937 |
| Allegiance: | Republican faction |
| Branch: | Spanish Republican Army |
| Type: | Infantry |
| Size: | Brigade |
| Battles: | Spanish Civil War |
The 183rd Mixed Brigade - originally created as the 3rd Asturian Brigade - was one of the mixed brigades created by the Spanish Republican Army for the defense of the Second Spanish Republic.
The unit was created at the beginning of February 1937 in Grullos, from the CNT nº3 battalion, being assigned to the 1st Asturian Division. The command of the Brigade fell to Víctor Álvarez González, who received military advice from Pedro Martínez Coll.
On April 27, the brigade set out with the 213rd, 216th and 230th battalions to the Vizcaya front, now under the command of the Joaquín Burgos Riestra. Upon its arrival in Vizcaya, it was added to the 2nd Basque Division, placing two of its battalions in Amorebieta and another in Miravalles. During the fighting of the Battle of Bilbao, on June 13 the unit was practically destroyed in the vicinity of the so-called "Belt of Death" —the last of the defensive lines that protected Bilbao. Its remains, however, managed to withdraw and later return to Asturias.
On August 6, the unit renamed the "183rd Mixed Brigade", within the 57th Division of the 16th Army Corps, giving command of it to José Penido Iglesias. After the start of the Asturias Offensive the 183rd MB was sent to Colombres, with the mission of defending the coastal highway, being added to Division «A» (provisional). On September 5, the Republicans lost control of Llanes, so the brigade was withdrawn from the front, towards Mieres, to join Division "C". Penido Iglesias was dismissed and replaced by Ángel López Bonachela.
Towards October 5, the unit was covering the front of the mountain passes, on the heights of "El Pedrusco", "El Castillo", "Altocena" and "Busdrugo", but an advance of the nationalist forces of Antonio Aranda led them to the Campo del Caso, causing the isolation of the republican forces; all the brigade troops were taken prisoner, and the unit disappeared.