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树形笔石目（学名：Dendroidea）为羽鳃纲笔石亚纲的一目笔石动物。这类笔石呈树枝状，故名，也有呈漏斗状或丛状，分枝规则或不规则，枝间有时有横耙和绞结相联。始见于中寒武纪，是较早期的笔石，繁盛于早奥陶纪。其延续的时间很长，灭绝于早石炭纪。由于它演化快，分布广，因此是划分和对比古生代地层的重要化石之一。
科： †Acanthograptidae Bulman 1938
- 属：†Acanthograptus
- 属：†Airograptus Ruedemann 1916
- 属：†Aletograptus Obut and Sobolevskaya 1962
- 属：†Anisograptus Ruedemann 1937
- 属：†Aretograptus
- 属：†Bryograptus
- 属：†Calyxdendrum
科： †Chaunograptidae Bulman 1955
- 属：†Choristograptus
- 属：†Coremagraptus
- 属：†Cymatograptus
科： †Dendrograptidae Roemer 1897
- 属：†Graptolodendrum
- 属：†Koremagraptus
- 属：†Licnograptus
科： †Nephelograptidae Boucek 1957
- 属：†Ophigraptus
- 属：†Paratemnograptus
- 属：†Ptilograptus
- 属：†Ptiograptus
- 属：†Radiograptus
- 属：†Rhipidodendrum
- 属：†Sagenograptus
- 属：†Staurograptus
- 属：†Triograptus
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