RLB

RLB may refer to:


 * Raiffeisenlandesbanken, co-operative banks in Austria
 * Railroad Labor Board, arbitrated labor disputes in 1920s United States
 * Rider Levett Bucknall, a British-based global construction company
 * Reichsluftschutzbund, air raid protection organisation in Nazi Germany
 * Rebecca Long-Bailey (born 1979), British politician