Neilson and Company was a locomotive manufacturer in Glasgow, Scotland.
The company was started in 1836 at McAlpine Street by Walter Neilson and James Mitchell to manufacture marine and stationary engines. In 1837 the firm moved to Hyde Park Street and was known as Kerr, Mitchell and Neilson and, in 1840, Kerr, Neilson and Company, becoming Neilson and Mitchell in 1843.
Locomotive building began in 1843 for the local railways. In 1855 production of marine and stationary engines discontinued and the company changed its name again to Neilson and Company. Among those who later became notable in the field were Henry Dübs and Patrick Stirling.
By 1861, business had increased to such an extent, that a new works was built at Springburn, also named "Hyde Park Works." In 1864, Henry Dübs set up in business on his own at Queens Park Works, as Dübs and Company, taking a number of key staff with him. James Reid, who had previously worked for Neilson, however, returned and became a partner.