Samuel Walsh has had many one-person exhibitions in Ireland. In the 1980s and 1990s he held 5 one-person exhibitions with the Oliver Dowling Gallery, Dublin and from the late 1990s to the early 2000s he held 3 one-person shows with the Rubicon Gallery, also in Dublin. He has also showed at the RHA's Ashford Gallery, Dublin and Hillsboro Fine Art, Dublin; both in 2007.

He has had 2 one-person shows with the Vangard Gallery, Cork.

In 1991, the exhibition Fourteen Points of Entry, at the Oliver Dowling Gallery, studies based on the stations of the cross, was purchased in its entirety by the Irish Museum of Modern Art, Dublin. The collection is regularly shown in venues throughout Ireland.

In 1989 he toured a major show of paintings and drawings entitled: The Arena Paintings 1987-1989, to venues in Limerick, Cork and Dublin. In 2000, University College Cork held a self-selected retrospective of his drawings entitled: Drawings 1982-2000. The Hunt Museum, Limerick showed Small Works on Paper 1985-2001 in 2003. Also in 2003 he showed a new body of work entitled Ambit, at the Limerick City Gallery of Art, which also toured to Dublin. In 2003 he exhibited the Airborne Drawings, a set of drawings dedicated to his late father who served with the Allied Forces in Normandy in 1944. The show was held in Glór, in Ennis, Co. Clare the town where his father was born. In 2010 he showed a selection of paintings at the Hunt Museum, Limerick made between 2003-2009 titled: Explicatio, (Latin: progression).

He is presently working towards a major show of work titled 'The Coercion of Substance' for VISUAL, Carlow in the next 18-24 months. The title comes from a poem by Seamus Heaney.

See also The Divine Comedy page.

He has also held one-person shows in Foundation Binz39, Scoul-Nairs, SWITZERLAND in 1990 and Galerie B, Pont-Aven, FRANCE in 2002.