Ugg靴，或称“雪地靴”、“羊皮靴”，是一种常见于澳大利亚和新西兰的羊皮毛制便靴，男女皆可穿着。Ugg靴通常以双面羊皮制成，内面带羊毛，外面则经过鞣制，鞋底通常是人造质地。

Ugg靴起源于澳大利亚，在当地是一种实用的保暖便鞋。虽然羊皮靴在原产地主要是作为便鞋、拖鞋使用，但自60年代开始为冲浪爱好者所青睐，70年代开始传播到英国和美囯的冲浪爱好者群体。由于这种靴子与冲浪和澳大利亚生活方式的联系，90年代后期澳大利亚羊皮靴在美国成为时尚式样，并在2000年后在澳大利亚和新西兰以外的世界各地开始变为热门时尚鞋履，现在甚至有许多商家出售人造材料的廉价仿羊皮靴，以及中国等地制造的廉价羊皮靴，其中最著名的是美国的德克斯公司（Deckers）以大写“UGG”为商标出售的时尚羊皮靴。但至今Ugg靴在澳大利亚仍主要作为拖鞋使用，在公众场合穿着这种靴子被认为是“邋遢”（daggy）和“老土”（bogan）的特征。

Ugg boots (sometimes called uggs) is a term for a unisex style of sheepskin boot developed in Australia and New Zealand. The boots are typically made of twin-faced sheepskin with fleece on the inside, a tanned outer surface and a synthetic sole. The term, ugg boots, originated from Australia, initially for utilitarian footwear worn for warmth, and which were often worn by surfers during the 1960s. In the 1970s, the boots were introduced to the surf culture of the United Kingdom and the United States. Sheepskin boots became a fashion trend in the U.S. in the late 1990s and as a world-wide trend in the mid-2000s. In Australia, they are worn predominantly as slippers and often associated with "daggy" fashion sense, and "bogan" culture. Noteworthy Australian manufacturers of ugg boots include Luda Productions (which has roughly 75 percent of the market share in Australia), EMU Australia, and Uggs-N-Rugs.