Recently, we have discovered a new class of salts containing different amino acids. In the present paper, we report crystal structures of four types (A(1)HA(2)HY, A(1)HA(2)H···A(2)Y, A(1)HA(1)H···A(2)Y and A(1)H···A(2) 2 Y) of salts containing a hexafluorosilicate anion (Y is SiF 6 2− ) and amino acids glycine, sarcosine, dimethylglycine, betaine, β -alanine, and l -proline: ( β -AlaH)(BetH)SiF 6 ·H 2 O (I), ( β -AlaH)( l -ProH)SiF 6 (II), ( β -AlaH)( l -ProH··· l -Pro)SiF 6 (III), (BetH)(BetH···Sar)SiF 6 ·H 2 O (IV), (GlyH···DMG) 2 SiF 6 (V), and (DMGH···Sar) 2 SiF 6 (VI). The O⋅⋅⋅O distances in dimeric cations ( l -ProH··· l -Pro), (BetH···Sar), (GlyH···DMG), and (DMGH···Sar) are 2.439 (3), 2.5310 (12), 2.4979 (9), and 2.4612 (19) Å in (III), (IV), (V), and (VI), respectively.