A bend radius guide provides effective cable management and bend radius control to prevent microbending of fiber optic cables entering and exiting cable distribution enclosures. Using arcuate surfaces, the guide provides bend radius control to prevent against microbending at distribution enclosure openings in directions horizontal or vertical to the enclosure depending upon the placement of the guide. When used in conjunction, bend radius guides prevent microbending in both horizontal and vertical directions concurrently. Bend radius guides used in conjunction can manage a number of fiber cables while still allowing access to individual cables through an angled slot formed by the joining of two guides.