Louis Harper (23 April 1868 – 26 January 1940) was a civil engineer from the north-east of Scotland who designed a number of suspension footbridges towards the end of the 19th century. Harper was born in Aberdeen, Aberdeenshire, to John Harper and Margaret Ross. His father came from Turriff in Aberdeenshire, and worked as a fencer in Edinburgh and Glasgow before starting the family firm in Aberdeen in 1856, which became Harpers Ltd in 1885. John Harper patented a mechanism for straining wire, used both to make fences and later also for the cables of bridges. His son John took charge of the business until 1887, while his second son Louis served an apprenticeship with Jenkins & Mar, Civil Engineers.