John Pennington Thomasson (19 May 1841, in Bolton – 16 May 1904, in Heaton, Greater Manchester) was an English cotton spinner and Liberal Party politician.
In about 1862,he entered the cotton spinning firm founded by his grandfather at Mill Hill, in the Haulgh, Bolton, where he helped run the business of four cotton mills, with great success until 1871, when the partnership was dissolved and he continued with No.
They lived at Alderly Edge, Cheshire, and had three children, Lucas (1868), Beatrice (1870) and Franklin Thomasson (1873).
In 1881 he financed the building of the Haulgh Board School, gave £1,000 towards the founding of the Chadwick Museum, and built the Folds Road gymnasium.
In 1890 he gave Mere Hall, formerly the residence of Sir Benjamin Dobson, to the town as a public park, together with £5,000 towards alterations.