While he was the editor and primary writer, it was a collective effort with other Filipino writers and activists contributing articles. Some notable contributors included:
* José Rizal
* Graciano López Jaena
* Mariano Ponce
* Antonio Luna
* Félix Resurrección Hidalgo
It's important to note that while del Pilar was the editor and had a significant influence on the newspaper's content, La Solidaridad was a collaborative effort, reflecting the voices of various Filipino intellectuals and activists during the time.