原始诺尔斯语（Proto-Norse，亦称为Primitive Norse、Proto-Nordic「原始北欧语」、Ancient Nordic「古代北欧语」、Old Scandinavian「古斯堪地纳维亚语」、Proto-North Germanic「原始北日耳曼语」）是印欧语系的一个分支，通行于斯堪地纳维亚，被认为是从纪元前的原始日耳曼语发展而来。原始诺尔斯语是一个典型北日耳曼语支最早的阶段，也是斯堪地纳维亚最古老的古弗萨克文刻文上所记载的语言，大约通行于3至7世纪（相当于罗马铁器时代晚期和日耳曼铁器时代早期）。它在维京时期开始时发展成古诺尔斯语方言。

Proto-Norse (also Proto-Scandinavian, Primitive Norse, Proto-Nordic, Ancient Nordic, Old Scandinavian, Proto-North Germanic and North Proto-Germanic) was an Indo-European language spoken in Scandinavia that is thought to have evolved as a northern dialect of Proto-Germanic over the first centuries CE. It is the earliest stage of a characteristically North Germanic language, and the language attested in the oldest Scandinavian Elder Futhark inscriptions, spoken ca. from the 2nd to 8th centuries (corresponding to the late Roman Iron Age and the Germanic Iron Age). It evolved into the dialects of the Old Norse language at the beginning of the Viking Age about AD 800.