| An ancient distinguished Irish surname O Draigneain (Thornton) | Henry, William | Monograph or Collective Volume | Merv Griffin | 1999 |
| An old Irish clan Mac Donagh | Henry, William | Monograph or Collective Volume | Merv Griffin | 1999 |
| Blood for blood : the Black and Tan war in Galway | Henry, William | Monograph or Collective Volume | Mercier | 2012 |
| Coffin ship : the wreck of the brig St John | Henry, William | Monograph or Collective Volume | Mercier | 2009 |
| Éamonn Ceannt : supreme sacrifice | Henry, William | Monograph or Collective Volume | Mercier | 2012 |
| Famine : Galway's darkest years | Henry, William | Monograph or Collective Volume | Mercier | 2011 |
| Fields of slaughter the battle of Knockdoe, 1504 | Henry, William | Monograph or Collective Volume | Lackagh Museum Committee | 2004 |
| Forgotten heroes : Galway soldiers of the Great War, 1914-1918 | Henry, William | Monograph or Collective Volume | Mercier Press | 2007 |
| Galway : walking through history | Henry, William | Monograph or Collective Volume | The author | 2020 |
| Galway and the great War | Henry, William | Monograph or Collective Volume | Mercier Press | 2006 |
| Griffin in history and mythology | Henry, William | Monograph or Collective Volume | Merv Griffin | 1999 |
| Henry's Upper Lough Erne in 1739 | Henry, William
| Monograph or Collective Volume | Ballinakella | 1987 |
| Mervue | Henry, William | Monograph or Collective Volume | Mervue Festival Committee | 2003 |
| Pathway to rebellion : Galway 1916 | Henry, William | Monograph or Collective Volume | Mercier Press | 2016 |
| Robert O'Hara Burke : the celebrated Australian explorer | Henry, William | Article in Book | | 2003 |
| Robert O'Hara Burke, the great Australian explorer | Henry, William | Article in Journal | | 1998 |
| Robinson, son of Robin | Henry, William | Monograph or Collective Volume | Merv Griffin | 1999 |
| Role of honour : the mayors of Galway city, 1485-2001 | Henry, William | Monograph or Collective Volume | Galway County Council | 2002 |
| St Clerans : the tale of a manor house | Henry, William | Monograph or Collective Volume | Merv Griffin | 1999 |
| Supreme sacrifice : the story of Éamonn Ceannt, 1881-1916 | Henry, William | Monograph or Collective Volume | Mercier Press | 2005 |
| The Burke family of St Clerans | Henry, William | Monograph or Collective Volume | Merv Griffin | 1999 |
| The Chamberlain family connection with St Clerans | Henry, William | Monograph or Collective Volume | Merv Griffin | 1999 |
| The Eyre family connection with Galway | Henry, William | Monograph or Collective Volume | Merv Griffin | 1999 |
| The O'Hara family connection with St Clerans | Henry, William | Monograph or Collective Volume | Merv Griffin | 1999 |
| The shimmering waste : the life and times of Robert O'Hara Burke | Henry, William | Monograph or Collective Volume | The author | 1997 |
| Tuam and the Great War | Henry, William | Article in Journal | | 2006 |