长毛砂藓（学名：Racomitrium lanuginosum）为紫萼藓科砂藓属下的一个种。

Racomitrium lanuginosum is a widespread species of moss found in montane and arctic tundra across the Northern and Southern hemispheres. It grows as large mats on exposed rock and in boulder scree, particularly on acidic rocks. Its leaves have a characteristically decurrent and toothed hair-point, which gives rise to its regional common names woolly fringemoss, hoary rock-moss and woolly moss.