Lewis Haslam (25 April 1856 – 12 September 1922), was a Liberal Party Member of Parliament (MP) in Wales, representing Monmouth Boroughs from 1906 to 1918 and then Newport from 1918 until his death in 1922.
Haslam was the son of John Haslam of Gilnow House in Bolton in Lancashire. He was educated at University College School and University College, London. In 1893 he married Helen Norma Dixon of Watlington, Oxfordshire.
Haslam was the director of cotton spinning and manufacturing companies. He has been classified as a genuinely second generation self-made man and was among the most wealthy MPs of his time. He also served as a Justice of the Peace for the county of Lancaster.
At the 1892 general election he contested the Westhoughton Division of Lancashire, in opposition to Lord Stanley reducing the Conservative majority by 500 votes. He does not appear to have been a candidate in 1895 but in 1900 he stood in Stamford in Lincolnshire, again without success.