County Galway on Wikipedia.

Athenry, a distant view of the former St. Mary, now used as a Heritage Centre. St. Mary's Collegiate Church. Another view. All from old postcards in Reg Dosell's Collection. Church of the Assumption (R.C.), and two interior views - 1, 2, all © John Balaam (2010).

Ballinasloe, St. Michael (R.C.). Another view. Both from old postcards in Reg Dosell's Collection.
Ballygar, St. Mary (R.C., 1857). M 786 526. © Gerard Close (2017). Link.

Claregalway, Church of the Assumption and St. James (R.C., 1975). M 370 323. Link. The ruins of Claregalway Priory, a Franciscan Abbey, which dates from 1252. M 371 333. Link. Both © Gerard Close (2017).
Clifden, St. Joseph (R.C.). From an old postcard in Reg Dosell's Collection.
Clonberne, the church at Ballinasloe. © Martina Kelly. Link.
Clonfert, the St. Brendan's Cathedral (CoI), on an external website. The 12th century Romanesque doorway, © Christopher Skottowe (1965). Many more photos here.
Creeragh, Our Lady of the Wayside (R.C.). © Len Brankin.

Cornamona, R.C. church. © Bill Henderson.

Galway.

Headford, R.C. church. © Bill Henderson.

Kilmilkin, Holy Nativity (R.C.). © Len Brankin.
Kylemore - see Letterfrack.

Leenane, R.C. church. © Bill Henderson.
Letterfrack, the church (1877-81) in the grounds of Kylemore Abbey, no longer used for services. Interior view. Both © John Balaam (2012). Link.
Loughrea, St. Brendan Cathedral (R.C.). © Aidan McRae Thomson. Link. The former St. Brendan (CoI). This photo was taken in the 1990's, before it was converted to a public library. © Alistair Quinlan.

Milltown, St. Joseph (R.C., 1970). M 399 633. © Gerard Close (2017). Link, which also has a photo of the predecessor church - is this still extant?).
Moylough, St. Patrick (R.C.). © Joan Harrison.

Salthill, Christ the King (R.C.). Three interior views - 1, 2, 3. All © Adam McCurdy (2014). Link.
Spiddall, St. Enda (R.C.). Disused Protestant chapel (built 1776). Both © Bill Henderson.

Tuam, the Cathedral Church, shown as it was in about 1800, and after the restoration of 1865. Illustration from Colin Waters Collection.

Williamstown, St. Therese (R.C.). © Joseph Cantwell.
Woodlawn, Parish Church (CoI). © Alistair Quinlan (2009).