Robert Lewis Roumieu (1814 – 1877) otherwise R.L. Roumieu, was a 19th-century English architect whose designs include Milner Square in Islington and an idiosyncratic vinegar warehouse at 33–35 Eastcheap in the City of London. A pupil of Benjamin Dean Wyatt, he worked in partnership with Alexander Dick Gough between 1836 and 1848.