华盛顿棕榈（学名：washingtonia filifera）又名丝葵、老人葵、加州蒲葵等，是棕榈科丝葵属的一种植物。

常绿乔木。茎单生，高20～30米，浅灰色，基部通常不膨大，顶端稍细，有纵裂纹或皱纹。近圆形大型叶片，直径2～3m，掌状深裂，裂片50～100片，边缘、先端及裂口有多数细长、下垂的丝状纤维，似白发苍苍的老人，所以又名老人葵。枯叶先端稍下垂，宿存被覆树干。

肉穗花序，白色大型花。椭圆形核果，长1～1.5cm，熟时黑色，微有皱纹。

Washingtonia filifera, also known as desert fan palm or California fan palm or California palm, is a flowering plant in the palm family (Arecaceae), and native to the southwestern U.S. and Baja California. Growing to 15–20 m (49–66 ft) tall by 3–6 m (10–20 ft) broad, it is an evergreen monocot with a tree-like growth habit. It has a sturdy columnar trunk and waxy fan-shaped (palmate) leaves.