造山纪（Orosirian，符号PP₃）是地质时代中的一个纪，开始于同位素年龄20亿5000万年前，结束于18亿年前。

造山纪期间蓝藻、细菌繁盛。

造山纪属于前寒武纪元古宙古元古代；造山纪的上一纪为层侵纪，下一纪为固结纪。

The Orosirian (pronunciation: /ˌɒroʊˈsɪəriən/; Greek:oroseira - ὀροσειρά, meaning "mountain range") is the third geologic period in the Paleoproterozoic Era and lasted from 2050 Mya to 1800 Mya (million years ago). Instead of being based on stratigraphy, these dates are defined chronometrically.