於堅（1954年－），雲南昆明人，中國現代詩人。曾經當過工人，1984年畢業於雲南大學中文係。
Yu Jian (Chinese: 於堅;), born 1954, is a Chinese poet, writer and documentary film director. He is a major figure among ‘The Third Generation Poets’ that came after the Misty Poetry movement of the early 1980s. His work has been translated into English, French, German, Dutch, Spanish, Italian, Swedish, Danish, and Japanese.