The title compound, [Li(NH3)4]+[Li(NH3)3S3]-, an ammoniate of the previously unknown lithium trisulfide, was obtained from the reaction of lithium and sulfur in liquid ammonia. The asymmetric unit consists of two crystallographically independent formula units. The [Li(NH3)4]+ cations are close to regular LiN4 tetrahedra. The anions contain LiSN3 tetrahedra; the S-S-S bond angles are 110.43 (5) and 109.53 (5)°. In the crystal, the components are linked by multiple N-H...S hydrogen bonds. A weak N-H...N hydrogen bond is also present.