| Abbreviation | Definition |
|---|---|
| KLF | Kamel Lazaar Foundation |
| KLF | Kansas Livestock Foundation |
| KLF | Kopyright Liberation Foundation |
| KLF | Kopyrite Liberation Foundation |
| KLSF | Kansas Lions Sight Foundation |
| KLSF | Kristin Linnea Skvarla Foundation |
| KNF | Kgosi Neighbourhood Foundation |
| KOCF | Kingdom Oil Christian Foundation |
| KOPF | Knowing Our Past Foundation |
| KORIL-RDF | Korea / Israel Industrial Research and Development Foundation |
| KSF | Kevin Spacey Foundation |
| KSF | Korea Science Foundation |
| KSRF | Keeshond Sunshine Rescue Foundation |
| KTF | Kokoda Track Foundation |
| KWEF | Kurita Water and Environment Foundation |
| LACF | Lake Avenue Community Foundation |
| LACF | Landscape Architecture Canada Foundation |
| LACF | Laredo Area Community Foundation |
| LACF | Lexington Area Community Foundation |
| LACF | Los Altos Community Foundation |