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- Jacques Lacan
- George Trumbull Ladd
- Ellen Langer
- Jan van der Lans
- Karl Lashley
- Bibb Latane
- Jan Lauwereyns
- Richard Lazarus
- Timothy Leary
- Mark Lepper
- Kurt Lewin, social psychology
- David Lewis
- Rensis Likert, Likert Scale
- Marsha M. Linehan
- Elizabeth Loftus
- Konrad Lorenz
- Barry Lubetkin
- Alexander Luria
Read more about this topic: List Of Psychologists