Bob Hartman is listed in the credits for the following albums:
| Year | Artist | Album | Role |
|---|---|---|---|
| 1974 | Petra | Petra | Songwriter, Guitar, Banjo, Vocals |
| 1977 | Albrecht Roley & Moore | Gently Flowing Feeling | Electric Guitar |
| 1977 | Petra | Come and Join Us | Songwriter, Guitars, Percussion, Vocals |
| 1979 | Petra | Washes Whiter Than | Songwriter, Lead and Rhythm Guitars, Vocals |
| 1981 | Petra | Never Say Die | Songwriter, Guitars |
| 1982 | Petra | More Power to Ya | Songwriter, Guitars |
| 1983 | Petra | Not of This World | Songwriter, Lead and Acoustic Guitars, Background Vocals |
| 1984 | Petra | Beat the System | Songwriter, Lead Guitar, Background Vocals |
| 1986 | Petra | Captured in Time & Space | Songwriter, Electric and Acoustic Guitars, Synthesizer Guitar |
| 1986 | Petra | Back to the Street | Arranger, Songwriter, Guitars |
| 1987 | Petra | This Means War! | Songwriter, Lead Guitar, Programming |
| 1988 | Geoff Moore & The Distance | A Place to Stand | Guitar |
| 1988 | Petra | On Fire | Arranger, Songwriter, Lead Guitar |
| 1989 | Mastedon | It's a Jungle Out There | Songwriter |
| 1989 | Petra | Petra Means Rock | Songwriter, Arranger, Lead and Acoustic Guitars, Background Vocals |
| 1989 | Petra | Petra Praise: The Rock Cries Out | Producer, Arranger, Songwriter, Guitars |
| 1990 | One Bad Pig | Swine Flew | Songwriter, Guitar Solo |
| 1990 | The Rap'Sures | Loud, Proud, and Born Again | Songwriter |
| 1990 | Petra | War and Remembrance: 15 Years Of Rock | Arranger, Songwriter, Lead and Acoustic Guitars, Background Vocals |
| 1990 | Halo | Halo | Arranger |
| 1990 | Petra | Beyond Belief | Arranger, Songwriter, Guitars |
| 1991 | Petra | Petrafied: The Best of Petra | Arranger, Songwriter, Lead and Acoustic Guitars, Background Vocals |
| 1991 | Petra | Unseen Power | Arranger, Songwriter, Guitars |
| 1992 | Petra | En Albanza | Producer, Arranger, Songwriter, Guitars |
| 1992 | Petra | Petraphonics | Arranger, Songwriter, Lead and Acoustic Guitars, Background Vocals |
| 1993 | Petra | The Power of Praise | Arranger, Songwriter, Lead and Acoustic Guitars, Background Vocals |
| 1993 | Petra | Wake-Up Call | Songwriter, Guitars |
| 1994 | Petra | Power Praise | Producer, Arranger, Songwriter, Guitars |
| 1995 | Petra | No Doubt | Executive Producer, Songwriter, Guitars |
| 1995 | Petra | Rock Block | Songwriter, Lead and Acoustic Guitars, Background Vocals |
| 1996 | Petra | The Early Years | Songwriter, Lead and Rhythm Guitars, Vocals |
| 1997 | Petra | Petra Praise 2: We Need Jesus | Executive Producer, Songwriter, Guitars |
| 1998 | Petra | God Fixation | Executive Producer, Songwriter, Guitars |
| 2000 | Petra | Double Take | Executive Producer |
| 2001 | Petra | Revival | Engineer, Guitars, Background Vocals |
| 2002 | Petra | Still Means War! | Producer, Arranger, Songwriter, Guitars |
| 2003 | Petra | Jekyll & Hyde | Engineer, Songwriter, Guitars |
| 2005 | Petra | Farewell | Songwriter, Guitars, Background Vocals |
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