Sir Roger Mostyn (1567 – 18 August 1642) was an English politician who sat in the House of Commons from 1621 to 1622.
He matriculated at Brasenose College, Oxford, on 8 May 1584, aged 16, and was admitted at Lincoln's Inn in 1588.
In 1602 purchased a 13-year lease of Mostyn Colliery for £70 and immediately began a programme of expansion.
[1] By 1616 he had three pits on the colliery site and by 1619 the colliery was worth in the region of £700 annually to the Mostyn family, which suggests a fairly substantial output.
He was the grandfather of Sir Roger Mostyn, 1st Baronet.