San Rafael Obrajuelo is a municipality in the department of La Paz, El Salvador.

According to the report of the Intendent of San Salvador Antonio Gutiérrez y Ulloa, in 1807 the estate of Obrajuelo, belonging to the Marquess of Aycinena existed.

In mid-nineteenth century, the settlement had achieved notable commercial activity and retained the population required by law to form a new municipality.

Although the ereccional decree does not mention it, the new municipality founded in Obrajuelo and San Pedro Martir cantons, jurisdiction of San Juan Nonualco, its naming was considered a tribute for President Rafael Zaldívar, and performed during his tenure.

[1] On March 30 of the same year, residents of the new municipality elected their first authorities, chaired by the provincial governor.