Lan Su is a walled Chinese garden that occupies an entire city block in Portland, Oregon. Designed by Kuang Zhen, it was completed in 1999–2000 by Chinese artisans from Suzhou, Jiangsu Province, China, using traditional materials and techniques.

The name Lan Su is taken from parts of the names of the sister cities of Portland and Suzhou. The name itself can be interpreted as the Garden of Awakening Orchids.

The view above focuses on the Moon Locking Pavilion, whose name refers to when the reflection of the moon can be seen in the center of the lake, locked in or framed by the shadow of the pavilion. To the left, in the background, is the Painted Boat in Misty Rain pavilion, representing the friendship that sailed from Suzhou and docked in Portland.