Portland Island Lighthouse is a historic lighthouse located off the southern coast of Mahia Peninsula in New Zealand. Built in 1878, it originally stood on Portland Island, an isolated location known for its strong ocean currents and hazardous seas. The lighthouse played a crucial role in guiding ships safely along New Zealand's eastern coast, particularly around the Mahia Peninsula, where treacherous conditions made navigation difficult.

In 1957, the original wooden lighthouse structure was replaced by a modern automated light, and the current lighthouse continues to operate, though now unmanned. Portland Island is not easily accessible to the public, but its lighthouse remains an important part of New Zealand's maritime heritage.

Mahia Peninsula itself is a stunning area known for its natural beauty and wildlife, making it a great destination for those interested in coastal history and scenic views. The lighthouse, although no longer in its original form, symbolizes the region's rich nautical past.