WLB
WLB may refer to:

Organisations
Welsh Language Board, a former UK statutory body
Wiener Lokalbahnen, an Austrian railway company
Württembergische Landesbibliothek, the Württemberg State Library, in Stuttgart, Germany

Other uses
Radio K, Minnesota, US, by former callsign
USCG seagoing buoy tender, by hull classification symbol
Wiffle League Ball, a wiffle ball league
Work–life balance, a concept referring to proper prioritizing between career and personal life development
Weakside linebacker, a defensive position in American and Canadian football
What Lies Beneath (Tarja album), an album from Finnish singer Tarja