| Acronym | Definition |
|---|
| TFSS➣Toyota Financial Services Securities (various locations) |
| TFSS➣Toronto Foundation for Student Success (student advocate organization; Canada) |
| TFSS➣Turner Fenton Secondary School (Brampton, Ontario, Canada) |
| TFSS➣Technical Field Support Services (Natural Resources Canada) |
| TFSS➣Tyco Fire and Security Services (China) |
| TFSS➣Thomas-Fermi-Scott-Schwinger |
| TFSS➣Type Four Secretion Apparatus (microbiology) |