NLL may refer to:
Sports Two unrelated lacrosse leagues by the name of National Lacrosse League: National Lacrosse League, an ongoing league formed in 1987 National Lacrosse League (1974–75), a defunct league formed in 1974 Northern Lakes League, a Northwest Ohio High School athletic conference Nación Lucha Libre, a Mexican professional wrestling promotion
Politics
Northern Limit Line, a disputed maritime boundary between North and South Korea Northern Limit Line (2015 film), South Korean naval thriller film National Liberation League in Palestine, a defunct political party in Palestine
Institutions New Line Learning Academy, a school in Loose, England The National Library of Latvia Foundation NLL, a former name of the Royal Netherlands Aerospace Centre
Transportation
The North London Line, a railway line in London, England