LO, The Danish Confederation of Trade Unions (Danish: LO, Landsorganisationen i Danmark or simply LO) was founded in 1898 and is an umbrella organisation (the largest of the three national trade union centers in Denmark) for 18 Danish trade unions.

The LO has a membership of 1,224,108 and cooperates with the two other Danish trade union centers, i.e. the AC – The Danish Confederation of Professional Associations and the FTF – Confederation of Professionals in Denmark.