| Abbr. | Logo | Ideology | Founded | Founder | Leader | Website | European Parliament Group |
| Α |  | Social democracy | 15.10.1871 | Mette Frederiksen | socialdemokratiet.dk |  |
Elections
| Date | Elections | % | Votes | Seats | |
| 2022 | 27,50 | 971.955 | 50 | 1st | |
| 2019 | 25,90 | 914.882 | 48 | 1st | |
| 2019 | EU | 21,48 | 592.645 | 3 | 2nd |
| 2015 | 26,31 | 925.288 | 47 | 1st | |
| 2014 | EU | 19,18 | 435.245 | 3 | 2nd |
| 2011 | 25,05 | 879.615 | 44 | 2nd | |
| 2009 | EU | 21,49 | 503.439 | 4 | 1st |
| 2007 | 25,47 | 881.037 | 45 | 2nd | |
| 2005 | 25,40 | 867.349 | 47 | 2nd | |
| 2004 | EU | 32,65 | 618.412 | 5 | 1st |
| 2001 | 29,08 | 1.003.323 | 52 | 2nd |
| Leaders | |
| 1871 – 1872 | Louis Pio |
| 1872 – 1873 | Carl Würtz |
| 1873 – 1875 | Ernst Wilhelm Klein |
| 1875 – 1877 | Louis Pio |
| 1877 – 1878 | Christen Hørdum |
| 1878 – 1878 | A.C. Meyer |
| 1878 – 1880 | Saxo W. Wiegell |
| 1880 – 1882 | Christen Hørdum |
| 1882 – 1910 | Peter Christian Knudsen |
| 1910 – 1939 | Thorvald Stauning |
| 1939 – 1955 | Hans Hedtoft |
| 1955 – 1960 | H. C. Hansen |
| 1960 – 1962 | Viggo Kampmann |
| 1962 – 1972 | Jens Otto Krag |
| 1972 – 1987 | Anker Jørgensen |
| 1987 – 03.09.1992 | Svend Auken |
| 03.09.1992 – 14.12.2002 | Poul Nyrup Rasmussen |
| 14.12.2002 – 12.04.2005 | Mogens Lykketoft |
| 12.04.2005 – 28.06.2015 | Helle Thorning-Schmidt |
| 28.06.2015 – | Mette Frederiksen |
