Sir Mark Oldroyd (30 May 1843 – 5 July 1927) was a British woollen manufacturer and Liberal Party politician from West Riding of Yorkshire.

He then trained as a minister at New College London, but he did not pursue his vocation and returned to Dewsbury in 1862, getting a job at the family woollen firm.

In 1877 John got into financial difficulties and was forced to leave the company, putting Mark in charge of rebuilding and managing the business, which he did with great success.

By 1888 the company employed 2000 people on 18 acres (73,000 m2) of mill floor space, and had invested in a pair of collieries at Castleford, which supplied coal for the textile industry.

Local and national commitments diverted Mark's attentions from the company, and he resigned his life directorship in 1913.