John Brown FRSE FRCPE (22 September 1810 – 11 May 1882) was a Scottish physician and essayist known for his three-volume Horae Subsecivae (Leisure Hours, 1858), containing essays and papers on art, medical history and biography. Best remembered are his dog story "Rab and his Friends" (1859) and his essays "Pet Marjorie" (1863), on Marjorie Fleming, the ten-year-old prodigy and alleged "pet" of Walter Scott, "Our Dogs", "Minchmoor", and "The Enterkine". Brown was half-brother to the organic chemist Alexander Crum Brown.