| Acronym | Definition |
|---|
| SEL | Select |
| SEL | Schweitzer Engineering Laboratories |
| SEL | Selector |
| SEL | Social and Emotional Learning |
| SEL | Selig |
| SEL | Système d'Echange Local (French: Local Exchange System) |
| SEL | Société d'Exercice Libéral (French: Private Practice Company; business provision) |
| SEL | System Event Log (Intel) |
| SEL | Swedish Elite League (hockey) |
| SEL | Sound Exposure Level |
| SEL | Software Engineering Laboratory |
| SEL | Service d'Entraide et de Liaison (French: Mutual Aid Service Link) |
| Sel | Selian (linguistics) |
| SEL | Suzlon Energy Limited |
| SEL | Surface Emitting Laser |
| SEL | Single-Event Latchup (of electronic circuits in space) |
| SEL | Single Engine Land (FAA pilot rating) |
| SEL | Space Environment Laboratory |
| SEL | Serial Experiments Lain (anime) |
| SEL | Socioeconomic Level |
| SEL | Size Exclusion Limit ( cytology) |
| SEL | Systems Engineering Laboratories |
| SEL | Système d'Etanchéité Liquide (French: Liquid Waterproofing System) |
| SEL | Safety Engineering Laboratory (Los Gatos, CA) |
| SEL | School of Engineering and Logistics |
| SEL | Serbia Esperanto-Ligo (Serbian Esperanto Association) |
| SEL | Seoul, South Korea - Kimpo International (Airport Code) |
| SEL | Solid End Link (jewelry) |
| SEL | Scientologie Espace Librairie (Scientology bookstore, France) |
| SEL | Standard Elektronik Lorenz AG (Stuttgart, Germany) |
| SEL | Secondary Epidermal Lamellae |
| SEL | Space Environmental Monitor |
| SEL | Swedish Eliteserien |
| SEL | Special Equipment List |
| SEL | Signal Engineering Laboratories |
| SEL | SATCOM Engineering Labs |
| SEL | Safetech Environmental Ltd. (Mississauga, Ontario, Canada) |
| SEL | System Effectiveness Level |
| SEL | Selected Environmental Library |
| SEL | Skin-Effect Limit (microstrip lines) |
| SEL | Support/Selected Equipment List |
| SEL | Système d'Evaluation de Logement (French: Housing Evaluation System; Switzerland) |
| SEL | Science Education Laboratory (various locations) |
| SEL | Science & Engineering Library (various schools) |
| SEL | Synergy Engineering Ltd. (Canada) |
| SEL | Standard Equipment List (various organizations) |
| SEL | Services en Ligne (French: Online Services; various organizations) |