Horikawa Ryo CDs (miscellaneous)
Ryo appears (sings/talks) in the following miscellaneous CDs.
| 1989.05.01 | Lodoss Tou Senki (KC-028) | Talk |
| 1990.12.16 | Condition Green Song Collection (VICL-5046) | Song |
| 1990.12.21 | Saint Seiya Meiou Hades Hen (COCC-7089) | Talk |
| 1991.07.01 | Magical Taruruuto-kun Hit Kyoku Shuu II (COCC-7707) | Song |
| 1992.10.28 | 92 Seiyuu Graffiti | Song |
| 1994.08.24 | GS Mikami Gokuraku Daisakusen (KICA-211) | Talk |
| 1994.10.26 | Fake (TOCT-8591) | Talk |
| 1995.03.17 | Seiyuu Daisuki 2 (MRCA-20058) | Talk |
| 1995.04.21 | GS Mikami Report 1 (KICA-239) | Talk |
| 1995.06.10 | Wedding Dress ni Akai Bara 1 (TKCA-70637) | Talk |
| 1995.09.21 | GS Mikami Report 2 (KICA-280) | Talk |
| 1995.12.16 | Seiyuu Daisuki 3 (MRCA-20080) | Talk |
| 1995.12.21 | GS Mikami Report 3 (KICA-281) | Talk |
| 1995.12.21 | Tokyo Denki Kirakira Gasshoudan The Heros (TDCD-1123) | Song |
| 1996.01.19 | Seiyuu Daisuki 4 Wedding Bell | Talk |
| 1997.05.21 | Voice Actor Best Song Collection 90 (APCM-5101) | Song |
| 1997.05.21 | Voice Actor Original Drama Collection II (APCM-5103) | Talk |
| 2004.11.10 | Stella Deus Another Legend (SVWC-7220) | Talk |
| 2008.11.07 | Shining Force Exa Drama CD (VGCD-0156) | Talk |