Mark Williamson is listed in the credits for the following albums:
| Year | Artist | Album | Role |
|---|---|---|---|
| 1982 | Sheila Walsh | Future Eyes | Bass |
| 1983 | Paul Field | Daybreak | Vocals |
| 1984 | Sheila Walsh | Triumph in the Air | Background Vocals |
| 1984 | Paul Field | Building Bridges | Background Vocals |
| 1985 | Paul Field | Visions | Vocals |
| 1986 | Sheila Walsh | Shadowlands | Background Vocals |
| 1986 | Chris Eaton | Vision | Background Vocals |
| 1987 | Steve Camp | After God's Own Heart | Background Vocals |
| 1987 | Russ Taff | Russ Taff | Backing Vocals, Boys Choir |
