The Union of Bulgarian National Legions (UBNL) (Bulgarian: Съюз на Българските Национални Легиони (СБНЛ); Sayuz na Balgarskite Natsionalni Legioni (SBNL)), until 1935 the Union of the National Youth Legions (UNYL); Съюз на Младежките Национални Легиони (СМНЛ); Sayuz na Mladezhkite Natsionalni Legioni (SMNL), was an ultranationalist, pro-fascist, pro-Nazi, and right extremist organization in Bulgaria, which was active between 1932 and 1944.

It rivalled for political support with other popular nationalist organizations such as the Ratniks and the National Social movement.

In 1942 Hristo Lukov, a retired Bulgarian army lieutenant general and former minister of war became head of the organization.

Identifying itself as an extreme monarchist group, it sought unsuccessfully to work with the National Social Movement before finally emerging as an opposition group that was largely supportive of Nazism, but critical of Bogdan Filov's pro-Nazi government, which they defined as consisting of "capitalists, Judeo-Masons and Bolsheviks".

Besides Nikolay Poppetrov, quoted above, Rumen Daskalov[4] describes it as "having a complete fascist character during the years of WWII", which includes "far nationalistic and chauvinistic, authoritarian and totalitarian ideas, but even more tenacious and irreconcilable to any party-parliamentary forms and liberal-individualistic ideas, but also –more characteristically– leadership and elitism, racism, anti-Semitism, etc."