San Lucas Ojitlán is a town and municipality in Oaxaca in south-western Mexico. The municipality covers an area of 595.81 km. It is part of the Tuxtepec District of the Papaloapan Region.
As of 2005, the municipality had a total population of 19,871.
In Mexican history, the Plan of Tuxtepec was a plan drafted by General Porfirio Díaz in 1876 and proclaimed on 10 January 1876 in the Villa de Ojitlán municipality of San Lucas Ojitlán, Tuxtepec district, Oaxaca. It was signed by a group of military officers led by Colonel Hermenegildo Sarmiento and drafted by porfiristas Vicente Riva Palacio, Ireneo Paz, and Protasio Tagle on the instigation of Díaz. Díaz signed the previous version of the plan in December 1875, which did not include the three most important articles that appointed Diaz as president. It disavowed Sebastián Lerdo de Tejada as President, while acknowledging the Constitution and the Reform laws, and proclaimed Díaz as the leader of the movement. Díaz later became the president of Mexico, ushering in a period known as the Porfiriato.
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