Zamboanga Peninsula / Western Mindanao is a peninsula and an administrative region in the Philippines. Designated as Region IX, the region consists of three provinces, namely, Zamboanga del Norte, Zamboanga del Sur, and Zamboanga Sibugay, its component cities of Dipolog, Dapitan, Pagadian, and Isabela (Capital of Basilan Province, which is a part of the ARMM) and the Highly-urbanized city of Zamboanga. Pagadian City is the regional center. The region was previously known as Western Mindanao before the enactment of Executive Order No. 36 on September 19, 2001.

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