| Michael R. Lawrence | Ph.D. | No | | | | |
| David Layman | Ph.D. | Yes | | 16 and Older | | |
| Barry S. Layton | Ph.D. | Yes | | 16 and older | | |
| Minh-Thu T. Le | Ph.D. | Yes | | | | |
| Brian J. Leahy | Ph.D. | Yes | | | | |
| Brian K. Lebowitz | Ph.D. | Yes | | 6-100 | | |
| Susan McManus Lee | Ph.D. | Yes | | | | |
| Jin Lee-Kim | Ph.D. | Yes | | 16+ | | |
| Katie Ann Lehockey | Ph.D. | Yes | | 18+ | - District of Columbia
- North Carolina
| |
| Shelley L Leininger | Ph.D. | Yes | | 18 and older | - Arizona
- North Carolina
- South Carolina
| |
| Brenna C. LeJeune | Ph.D. | Yes | | Pediatrics | | |
| Carolyn M. Lemsky | Ph.D. | Yes | | 16 and older | | |
| Skyler Leonard | Ph.D. | Yes | | 0-22 | | |
| Elizabeth C Leritz | Ph.D. | Yes | | 18+ | - Massachusetts
- New Hampshire
- Rhode Island
- Vermont
| |
| David Frederick Lerner | Ph.D. | Yes | | 18 and up | | |
| Kathryn V. Lester | Psy.D. | Yes | | 18+ | | |
| Catherine L. Leveroni | Ph.D. | Yes | | 18+ | | |
| Andrew J. Levine | Ph.D. | Yes | | 17-99 | | |
| Laurence S. Levine | Psy.D. | Yes | | 16 and older | | |
| Maureen J. Levine | Ph.D. | No | | | | |
| Irene S. Lieban | Psy.D. | No | | | | |
| Roger K. Light | Ph.D. | Yes | | | | |
| John F. Linck | Ph.D. | Yes | | | | |
| Jared S. Link | Psy.D. | Yes | | 18+ | | |
| Sara M. Lippa | Ph.D. | Yes | | Adults | | |