United Welsh Church, Blackstone, Heritage church at Thomas Street, Blackstone, Australia.

The United Welsh Church is a timber church at 6 Thomas Street, Blackstone, with a rectangular nave and sanctuary forming a T plan with a rear vestry. Its stud frame is clad in chamferboard, the gable roof in corrugated galvanised iron, and the front porch has a fretwork pediment and a pointed timber ventilator above. Inside are cedar sanctuary joinery, a silky oak minister's chair, and leadlight windows with Welsh dragons above the vestry doors.

The church was designed by Ipswich architect Samuel Shenton and built in 1886 by contractors Worley and Whitehead on land donated by coal-mine owner Lewis Thomas, who had mined at Blackstone since the 1860s. Welsh slate miners from Blaenau Ffestiniog arrived in 1883 and first held services under a mulberry tree by Bundamba Creek. The building opened on 16 October 1886 with a tea-meeting and concert.

The church keeps Welsh traditions alive through bilingual hymn singing and regular Eisteddfod competitions that celebrate Welsh musical heritage in Queensland. Visitors can experience this cultural connection through the singing and performances that take place here.

The church stands at 6 Thomas Street, with a large camphor laurel on its northern side and two rock monuments in the grounds, one holding a centenary plaque and one a piece of rock from the Brynhyfryd mansion site. A part-time minister conducts a weekly service, and the interior displays historic photographs and memorabilia in the nave and rear meeting room.

This is Queensland's only Welsh church and stands as one of just four such buildings across all of Australia. The rarity of these temples makes them valuable records of Welsh immigration history.