| "Fair city" a thousand years of Dublin | | Monograph or Collective Volume | Poolbeg | 1988 |
| 'Níl contae níos deise...': the sense of place in the work of Donegal writers | McMahon, Seán | Article in Book | | 2013 |
| 'Wee Joe' : The life of Joseph Devlin | McMahon, Sean | Monograph or Collective Volume | The Brehon Press | 2011 |
| A history of County Derry | McMahon, Sean | Monograph or Collective Volume | Gill & Macmillan | 2004 |
| A short history of Ireland | McMahon, Sean | Monograph or Collective Volume | Mercier Press | 1996 |
| Battles fought on Irish soil : a complete account | McMahon, Seán | Monograph or Collective Volume | Londubh Books
| 2010 |
| Bombs over Dublin | McMahon, Sean | Monograph or Collective Volume | Currach Press | 2009 |
| Charles Stewart Parnell | McMahon, Sean | Monograph or Collective Volume | Mercier Press | 2000 |
| Daniel O'Connell | McMahon, Sean | Monograph or Collective Volume | Mercier Press | 2000 |
| Derry in old photographs | Byrne, ArtMcMahon, Sean | Monograph or Collective Volume | Gill & Macmillan | 2003 |
| Faces of Munster | | Monograph or Collective Volume | Appletree Press | 1977 |
| Faces of old Leinster | MacMahon, SeanÓ Broin, Art | Monograph or Collective Volume | Appletree Press | 1978 |
| Faces of the west, 1875-1925 | Byrne, ArtMcMahon, Sean | Monograph or Collective Volume | Appletree Press | 1976 |
| Faces of the west, 1875-1925 : a record of life in the west of Ireland | Byrne, ArtMcMahon, Sean | Monograph or Collective Volume | Appletree Press | 1977 |
| Foyle College and Donegal connections | McMahon, SeánMontgomery, Robert | Article in Journal | | 2020 |
| Galway of the races : selected essays of Robert Lynd | Lynd, RobertMcMahon, Sean | Monograph or Collective Volume | Lilliput Press | 1991 |
| Great Irish heroes | McMahon, Sean | Monograph or Collective Volume | Mercier Press | 2018 |
| Great Irish heroes | McMahon, Sean | Monograph or Collective Volume | Mercier Press | 2008 |
| Great northerners | Byrne, ArtMcMahon, Sean | Monograph or Collective Volume | Poolbeg | 1991 |
| Hope and history : eye witness accounts of life in twentieth century Ulster | King, Sophia H.McMahon, Sean | Monograph or Collective Volume | Friar's Bush | 1996 |
| Lives : 113 great Irishwomen and Irishmen | Byrne, ArtMcMahon, Sean | Monograph or Collective Volume | Poolbeg | 1990 |
| Robert Emmet | McMahon, Sean | Monograph or Collective Volume | Mercier Press | 2001 |
| Sam Hanna Bell : a biography | Mahon, Seán | Monograph or Collective Volume | Blackstaff Press | 2000 |
| Sam Hanna Bell : a biography | McMahon, Sean | Monograph or Collective Volume | Blackstaff Press | 1999 |
| The Best from The Bell | MacMahon, Sean | Monograph or Collective Volume | O'Brien Press | 1978 |
| The Derry anthology | | Monograph or Collective Volume | Blackstaff Press | 2002 |
| The Poolbeg book of Irish placenames | McMahon, Sean | Monograph or Collective Volume | Poolbeg | 1990 |
| Wolfe Tone | McMahon, Sean | Monograph or Collective Volume | Mercier Press | 2001 |