“普鲁士人”可能也指后来的近代强国普鲁士的国民

古普鲁士人或波罗的普鲁士人（德语：Pruzzen或Prußen，拉丁语：Pruteni，拉脱维亚语：Prūši，立陶宛语：Prūsai，波兰语：Prusowie）是一个族群，是属于波罗的语族，居住在普鲁士地区的原住民，而普鲁士位于波罗的海东南，在维斯瓦潟湖与库洛尼亚潟湖周围。他们讲普鲁士语，信奉多神教（普鲁士神话）。

在13世纪，普鲁士人被条顿骑士团征服，并在接下来的几个世纪中被同化。前德意志国家普鲁士从波罗的普鲁士人得到“普鲁士”之名，但这个国家其实主要是同化了古普鲁士人的德意志人；到17世纪或18世纪初，古普鲁士语已经灭绝。

"Prussians" may also refer to citizens of the former German state Prussia.

Old Prussians or Baltic Prussians (German:Pruzzen or Prußen; Prakrit:Prusas; Latin:Pruteni; Latvian:Prūši; Lithuanian:Prūsai; Polish:Prusowie; Kashubian:Prësowié) refers to the indigenous peoples from a cluster of Baltic tribes that inhabited the region of Prussia. This region, not to be confused with the later state of Prussia, was located on the south-eastern shore of the Baltic Sea between the Vistula Lagoon to the west and the Curonian Lagoon to the east. The people spoke a language now known as Old Prussian and followed pagan Prussian mythology.