Dunmore railway station is a heritage-listed disused railway station located on the South Coast railway line in Dunmore, New South Wales, Australia. The station served the southern Wollongong suburb of Dunmore and indirectly Shellharbour and opened on 9 November 1887. The weatherboard station on Platform 2 dates from 1887. It is also known as the Shellharbour Railway Station Group, Shellharbour railway station and Dunmore Railway Station. The property was added to the New South Wales State Heritage Register on 2 April 1999.

As part of the electrification of the line to Kiama in 2001, the existing crossing loop was extended north and received a platform, albeit built out of scaffolding materials with most trains continuing to use the original platform. The loop also provides access to Boral's Dunmore Quarry. There was previously a level crossing immediately south of the station. This was closed in the late-2000s as part of improvement works to the adjacent Princes Highway.

The township of Shellharbour was laid out in 1851 around the port of Shellharbour, on the Peterborough Estate. Shellharbour (Municipal) Council was constituted on 4 June 1859 and the chambers, built in 1865 was located in Addison Street, Shellharbour. Dunmore had a post office in 1890. The council relocated to Albion Park in 1897, coinciding with the decline of Shellharbour (Village) and the growth of Albion Park as a lucrative beef and dairy cattle district.

The Illawarra railway line from Wollongong to Scarborough was opened as an isolated line on 21 June 1887 with an extension to Bombo (North Kiama) from Wollongong opened on 9 November 1887. Finally on 3 October 1888 the connection to the northern Sydney section was made. An extension of the line from Bombo south to Bomaderry was completed in 1893.

Dunmore (Shellharbour) Railway Station was in the section of the line opened in November 1887. The awningless Platform 2 building is original (1887), the Out-of-room (aka old milk shed) was constructed in 1891 and extended in 1908. The signal box was constructed in 1925.

The 1887 Dunmore (Shellharbour) Station Master's residence is a relatively early brick example of the J2 design Station Master's residence, having been constructed in 1887 prior to the issue of the series of standard plans by the office of Henry Deane, Engineer-in-Chief for Railways Construction 1891–1901, for these buildings in 1899. Though Henry Deane was acting in this position from 1889 after the retirement of John Whitton, due to the 1887 construction date of this Station Master's residence, association of the design with Henry Deane is uncertain.

Plans dated 1907 show the railway station with (from south to north) a Gatekeeper's cottage (no longer extant) at the Shellharbour Road level crossing; platform with ramps at each end and a ramp north of the platform building; a milk shed; platform building with water tank at south end; lamp room and separate WC (toilet) building; cattle yards to the northeast of the platform building; and the Station Master's residence with underground water tank to the northeast of the station.

In 1923 a small line was linked to the main line at Dunmore (Shellharbour) Station to allow the blue metal quarry at Dunmore (which had operated since at least c. 1905) to access the rail network. The extra rail traffic generated by this may have given rise to the 1925 refurbishment plans which led to the construction of the signal box and the refurbishment of the 1887 platform building to provide a ladies' waiting room at the southern end; refurbished central waiting area in the centre (marked on plans as "waiting shed" indicating its open nature); a refurbished room at the northern end of the building for multiple use as Station Master's office, booking office and parcels office; and an awning roof to connect the Station Master's office etc. to a doorway into the new 1925 signal box at the southern end of the platform building. Plans dating from 1929 also show proposed additions to the Gatehouse.