Midlothian on Wikipedia.

Carrington, the former Parish Church. According to its Wikipedia entry, it was built in 1710-11, and closed in 1975, when the congregation united with Cockpen Church, which was re-named as Cockpen and Carrington Church (link). Its Canmore entry advises of an earlier church which stood within the present churchyard, but on a different site. NT 3186 6058. © Marion Bowles. Grade B listed. The associated Session House (seen on a 2011 Streetview here) is also listed as grade B.
Cranstoun Church (near Pathhead). © Bill Henderson.

Dalkeith.

Easthouses, Mayfield and Easthouses Church (CoS, 1954-5) on Bogwood Road. Another view. NT 3492 6509. Both © Marion Bowles (2020). A 2009 Streetview. Link.

Fala & Soutra, the parish church. © Bill Henderson.

Gorebridge, St. Margaret (R.C.). Two additional views - 1, 2. NT 3457 6123. Link. The former Free Church (1886) on Hunterfield Road. It was subsequently St. Paul U.F.C., St. Paul (CoS) and then Gorebridge Christian Fellowship, before conversion into a nursery. NT 3348 6159. A 2016 Streetview. News item about the sale from the Fellowship (Struthers Church, of which the Gorebridge Church was a branch) to the nursery. The nursery website has interior photos. Its Grade B listing advises that at one time it had a spire. All © Marion Bowles (2020).

Loanhead, the Parish Church. © Bill Henderson. Link.

Mayfield, St. Luke and St. Anne (R.C., 1971). A 2016 Streetview. NY 348 647. Link (mostly about St.  David, in the same parish). The Gospel Hall on Stone Avenue. Another view. A 2009 Streetview. NT 3495 6455. All © Marion Bowles (2020).

Newbattle, the Parish Church of 1727. Another view. NT 3312 6607. Link. Grade B listed. The former Manse, which stands adjacent, is also listed as Grade B, and is older than the present church. It's been in private residential use since the 1950's. A 2016 Streetview shows both buildings in the same view. A graveyard NE of the present church includes the site of its predecessor. NT 332 662. One of the monuments (the Lothian Vault) is Grade C listed. Newbattle Abbey is a large house, incorporating a tower house, which in turn includes some fabric from the C12 Cistercian Abbey, founded by David I in 1140. The arch at right here may be one such fragment. A plaque has a brief history. According to Pevsner, foundations of the Abbey church are exposed in the grounds. NT 333 660. Grade A listed. All © Marion Bowles (2020).
Newtongrange, Church of Scotland (1939-42). Another view. The current church hall visible behind the church in the latter view was built before the church, and was used as the church during that period. The chunky flying buttresses are an unusual feature! NT 334 642. Link. Grade C listed. Church of Christ. Two additional views - 1, 2. NT 335 643. Link. The former Free Church, now in use as a Masonic Hall. Old maps show it as Free Church in 1894, and United Free Church in 1907 and 1914. Dates here suggest 1874 and 1880 for the building of the church and hall (the latter visible here), but the order is uncertain. It became Church of Scotland following the union in 1929, and closed in 1940. Two further views - 1, 2. Link. NT 333 647. All © Howard Richter (2013).

Penicuik.

Roslin, the Collegiate Chapel of St. Matthew. NT 274 630 . From an old postcard in Steve Bulman's Collection. An example of the elaborate stone carving. A window. Figure. All © Bill McKenzie. Another view, and interior, both from an old album dateable to the 1890's in Christopher Skottowe's Collection. Link. Roslin Kirk (CoS). NT 269 631. © Bill Henderson. Another view, © Steve Bulman (2015).
Rosslyn, Midlothian - see Roslin above.