線毛（拉丁語：fimbria，複數：fimbriae）是很多革蘭氏陰性菌表面的附屬物，比鞭毛細。通常直徑3~10奈米，長度可達幾微米。線毛可被細菌用於附着在物體表面上。一個細菌可以有上千條線毛。線毛通常只能在電子顯微鏡下觀察到。
參考文獻
參見
- 鞭毛
- 性線毛
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