- 理论家 lǐlùnjiā theorista person who develops, studies, or specializes in the theoretical aspects of a subject
- 唯理论 wéilǐlùn rationalism(philosophy) rationalism
- 唯象理论 wéixiànglǐlùn phenomenology
- 定性理论 dìngxìnglǐlùn qualitative theory
- 弦理论 xiánlǐlùn string theorystring theory (physics)
- 归因理论 guīyīnlǐlùn attribution theoryattribution theory (psychology)
- 权变理论 quánbiànlǐlùn contingency theorycontingency theory (theory of leadership)
- 板块理论 bǎnkuàilǐlùn plate tectonics
- 概型理论 gàixínglǐlùn scheme theoryscheme theory (mathematics)
- 模块化理论 mókuàihuàlǐlùn modularity theory
- 混沌理论 hùndùnlǐlùn chaos theorychaos theory (mathematics)
- 理论基础 lǐlùnjīchǔ theoretical foundation
- 理论贡献 lǐlùngòngxiàn theoretical contribution
- 电磁理论 diàncílǐlùn electromagnetic theorythe theoretical framework and branch of physics describing the interactions between electric and magnetic fields
- 稳态理论 wěntàilǐlùn steady-state theorythe steady-state theory in cosmology
- 突变理论 tūbiànlǐlùn catastrophe theory(math.) catastrophe theory
- 结构理论 jiégòulǐlùn structural theorystructural theory (physics)
- 规范理论 guīfànlǐlùn gauge theoryStandard Model (of particle physics)
- 邓小平理论 Dèng Xiǎopíng Lǐlùn DengismDeng Xiaoping Theory; the political and economic ideology emphasizing market-oriented reforms under Communist Party control that served as the foundation for PRC development after the Cultural Revolution.
- 伽罗华理论 Jiāluóhuálǐlùn Galois theoryGalois theory (math.)
- 需求层次理论 xūqiúcéngcìlǐlùn hierarchy of needsMaslow's hierarchy of needs in psychology
- 伽罗瓦理论 Jiāluówǎlǐlùn Galois theory(math.) Galois theory
- 分类理论 fēnlèilǐlùn classification theory