In the mononuclear title compound, [Tb(C
13
H
9
OS
3
)
3
-(C
4
H
8
O)
3
]·C
4
H
8
O, the lanthanide cation is located on a threefold rotation axis and is surrounded by electron-rich ligands in an approximately octahedral geometry. One of the thienyl groups and the bound THF are disordered with 0.5:0.5 occupancy. The free THF is disordered around the threefold axis.