- SKG (Makedonia Airport)
- SKH (Shoot, Kill, Hack)
- SKI (Skikda Airport)
- SKIL (Stanford's Key to Information Literacy)
- SKIN (Share Knowledge, Inspire, Nurture)
- SKIP (Special Kids, Involved Parents)
- SKIPPER (Shaking Kills, Instead, Parents Please Educate and Remember)
- SKI-USF (Shotokan Karate International-United States Federation)
- SKK (Shaktoolik Airport (FAA: 2C7))
- SKL (Systems Knowledge Link)
- SKM (Seltzer Kaufmann Marketing)
- SKN (Stokmarknes Airport, Skagen)
- SKO (Samaratins, KELY, and Outward Bound Hong Kong)
- SKOT (Sredni Kolowy Opancerzny Transporter (armoured personnel carrier))
- SKP (Skopje Airport)
- SKPLT (Stick Plot Log)
- SKR (Storozhevoy Korabl')
- SKS (Skrydstrup Airport)
- SKSA (Storekeeper Seaman Apprentice)
- SKSN (Storekeeper Seaman)
- SKT (Specialty Knowledge Test)
- SKU (Skyros Island National Airport)
- SKV (St. Catherine International Airport)
- SKW (Skwentna Airport)