The interior of the church dates from the mid 1950s when extensive renovations had to be carried out due to the descovery of dry rot. At the rear right- hand side of the building there is a memorial plaque to the very rev. dr.joseph michell minister of the parish from 1890 till 1930 and moderator of the last general assembly before the union of the church of scotland and the united free church in 1929.

The organ was built by willis in 1888 for strathbungo parish church glasgow. it was gifted and installed in 1980 with a legacy bequeathed by the rev. a stewart the last minister of muachline north church .at this time the chancel was also refurbished.

the stained glass window was erected in 1903 and is dedicated to the memory of major general Sir Claud Alexander Bart. of Ballochmyle. It has four light which portray the story of christ and the centurion.

The silver baptismal basin was gifted in 1788 by the honourable Lady Anne Whiteford in acknowledgement of the many happy years she had spent in Mauchline under the excellent instruction of the then minister the Rev. William Auld [daddie auld of Robert Burns the kirk's alarm]

In this connection the church still has in its possession the kirk session minute book relating to the burns era. In june 1786 he appeared before the session and admitted his responsibility for Jean Armour's pregnancy and as a result both had to appear in church on three occasions to receive public rebuke. Two years later both again appeared before the sessin when it was agreed that their marriage made peace with the church and gave a guinea note for the relief of the poor.

The covenanters flag was first used in an engagement between covenanters and royalist troop on Mauchline muir and was later carried at the battles of Drumclog and Bothwell brig in 1679. That Mauchline was a covenanters stronghold can be seen from the fact that the Miniser the Rev. Georgee Yong Signer the national covenant in greyfriars churchyard in edinburgh in 1638 and subscribed to the solemn league and covenant in 1643. The flag was handed over to the Kirk session for safe-keeping in 1955 and thereafter gifted to the congregation in 1980.

The covenanters flag is now framed and huge on south wall of the church.

The wrought iron celtic cross the font stand in the chancel and the flag holder now supporting the british legion colours were all made and gifted to the church by a local craftsman.