Trifluorosulfate is an ion with the formula SO2F3−. This term is ambiguous with three fluorosulfate ions (SO3F)3. It can also be confused with the trifluoromethyl sulfate ion.

The trifluorosulfate ion has a distorted trigonal bipyramid shape with C2v symmetry. On the equator are two oxygen atoms with a bond to sulfur of length 143.2 pm. Also one fluorine atom on the equator has a bond length of 157.9 pm. The two other fluorine atoms at the apexes of the pyramids have bond lengths 168.5 pm and form an angle ∠FSF of 165.2°.
| name | formula | weight | system | space group | unit cell | volume | density | properties | ref |
|---|---|---|---|---|---|---|---|---|---|
| tetramethylammonium trifluorosulfate | [(CH3)4N][SO2F3] | colourless | |||||||