Brown Line

Brown Line may refer to:
 * Brown line, a process defined as siderotype, a monochrome printing process
 * Brown Line (CTA), Chicago
 * Brown Line (Delhi Metro), Delhi, India
 * Brown Line (Mexico City Metro), Mexico
 * Brown Line (Pittsburgh), Pittsburgh, Pennsylvania
 * Bakerloo line, London, United Kingdom
 * BMT Nassau Street Line, a rapid transit line in New York City
 * J/Z (New York City Subway service)
 * Tangerang Line of KRL Commuterline, Jakarta, Indonesia
 * Paris Métro Line 11, Paris, France
 * Thomson–East Coast MRT line, Singapore
 * Ma On Shan line, Hong Kong, China
 * Tuen Ma line, Hong Kong, China
 * U5 (Berlin U-Bahn), Berlin, Germany
 * Wenhu line, Taipei, Taiwan