Sør-Trøndelag (; ) is one of the 19 multi-member constituencies of the Storting, the national legislature of Norway. The constituency was established in 1921 following the introduction of proportional representation for elections to the Storting. It consists of the municipalities of Åfjord, Frøya, Heim, Hitra, Holtålen, Indre Fosen, Malvik, Melhus, Midtre Gauldal, Oppdal, Orkland, Ørland, Osen, Rennebu, Rindal, Røros, Selbu, Skaun, Trondheim and Tydal in the county of Trøndelag. The constituency currently elects nine of the 169 members of the Storting using the open party-list proportional representation electoral system. At the 2025 parliamentary election it had 258,021 registered electors.

Electoral system Sør-Trøndelag currently elects nine of the 169 members of the Storting using the open party-list proportional representation electoral system. Constituency seats are allocated by the County Electoral Committee using the Modified Sainte-Laguë method. Compensatory seats (seats at large or levelling seats) are calculated based on the national vote and are allocated by the National Electoral Committee using the Modified Sainte-Laguë method at the constituency level (one for each constituency). Only parties that reach the 4% national threshold compete for compensatory seats.

Election results Summary Election CommunistsK RedsR / RV / FMS Socialist LeftSV / SF LabourAp GreensMDG CentreSp / Bp / L LiberalsV ChristianDemocratsKrF ConservativesH ProgressFrP / ALP colspan=3 colspan=3 colspan=3 colspan=3 colspan=3 colspan=3 colspan=3 colspan=3 colspan=3 colspan=3 Votes % Seats Votes % Seats Votes % Seats Votes % Seats Votes % Seats Votes % Seats Votes % Seats Votes % Seats Votes % Seats Votes % Seats2025 12,422 5.98% 0 14,265 6.87% 1 66,378 31.98% 4 11,953 5.76% 0 14,026 6.76% 1 7,602 3.66% 0 5,184 2.50% 0 25,893 12.47% 1 41,123 19.81% 22021 63 0.03% 0 10,852 5.62% 0 17,635 9.13% 1 57,621 29.82% 3 9,268 4.80% 0 29,181 15.10% 2 8,435 4.37% 0 4,211 2.18% 0 31,837 16.48% 2 16,650 8.62% 12017 5,344 2.94% 0 14,008 7.71% 1 59,610 32.79% 4 7,082 3.90% 0 19,409 10.68% 1 7,385 4.06% 0 4,974 2.74% 0 37,719 20.75% 2 21,248 11.69% 12013 97 0.06% 0 1,667 0.95% 0 9,992 5.70% 0 64,351 36.70% 4 5,540 3.16% 0 11,351 6.47% 1 9,460 5.39% 0 6,562 3.74% 0 38,930 22.20% 2 23,871 13.61% 22009 107 0.07% 0 2,057 1.27% 0 12,852 7.91% 1 66,614 40.98% 4 834 0.51% 0 11,803 7.26% 1 5,871 3.61% 0 6,189 3.81% 0 22,587 13.90% 1 31,885 19.62% 22005 98 0.06% 0 1,763 1.13% 0 16,764 10.72% 1 59,837 38.27% 4 360 0.23% 0 13,228 8.46% 1 6,983 4.47% 0 7,610 4.87% 0 19,518 12.48% 1 27,786 17.77% 22001 101 0.07% 0 1,604 1.08% 0 23,027 15.50% 2 42,899 28.87% 3 598 0.40% 0 10,243 6.89% 1 4,972 3.35% 0 14,710 9.90% 1 26,418 17.78% 2 17,637 11.87% 11997 135 0.09% 0 3,426 2.25% 0 10,510 6.91% 1 58,826 38.67% 4 514 0.34% 0 14,065 9.25% 1 6,121 4.02% 0 17,072 11.22% 1 20,661 13.58% 2 18,771 12.34% 11993 109 0.07% 0 1,392 0.96% 0 12,947 8.89% 1 57,464 39.46% 4 402 0.28% 0 26,678 18.32% 2 5,630 3.87% 0 9,577 6.58% 1 23,505 16.14% 2 5,653 3.88% 01989 1,692 1.07% 0 19,098 12.11% 1 57,463 36.43% 4 701 0.44% 0 12,577 7.97% 1 5,114 3.24% 0 11,505 7.29% 1 33,476 21.23% 2 15,602 9.89% 11985 383 0.25% 0 1,381 0.89% 0 10,810 6.94% 1 66,969 42.99% 4 12,802 8.22% 1 4,821 3.09% 0 10,414 6.68% 1 42,326 27.17% 3 5,168 3.32% 01981 546 0.37% 0 1,558 1.05% 0 9,411 6.34% 1 57,483 38.73% 4 12,056 8.12% 1 7,482 5.04% 0 10,913 7.35% 1 43,453 29.28% 3 4,484 3.02% 01977 600 0.44% 0 1,259 0.93% 0 7,292 5.40% 0 60,173 44.55% 5 15,442 11.43% 1 19,364 14.34% 2 28,903 21.40% 2 1,740 1.29% 01973 654 0.51% 0 17,304 13.62% 2 47,231 37.18% 4 17,220 13.56% 1 3,785 2.98% 0 13,184 10.38% 1 21,035 16.56% 2 3,741 2.94% 01969 1,821 1.41% 0 4,072 3.15% 0 62,199 48.17% 5 20,963 16.24% 2 8,481 6.57% 0 10,339 8.01% 1 21,244 16.45% 2 1965 2,738 2.24% 0 6,316 5.16% 0 55,155 45.07% 5 14,513 11.86% 1 10,194 8.33% 1 9,328 7.62% 1 24,134 19.72% 2 1961 4,317 4.00% 0 54,244 50.25% 5 15,951 14.78% 2 10,692 9.91% 1 19,896 18.43% 2 1957 4,228 3.96% 0 53,460 50.07% 5 11,259 10.54% 1 7,597 7.12% 1 11,486 10.76% 1 18,636 17.45% 2 1953 6,838 6.35% 0 51,146 47.53% 5 11,001 10.22% 1 8,682 8.07% 1 11,277 10.48% 1 18,660 17.34% 2 1949 3,335 4.59% 0 32,517 44.77% 3 10,608 14.60% 1 8,538 11.75% 0 8,712 11.99% 1 8,590 11.83% 1 1945 4,411 7.26% 0 25,362 41.72% 3 8,006 13.17% 1 9,501 15.63% 1 7,253 11.93% 1 6,078 10.00% 0 1936 23,005 38.91% 3 12,107 20.48% 1 12,204 20.64% 1 9,285 15.70% 1 1933 1,293 2.62% 0 18,341 37.12% 3 11,073 22.41% 1 11,715 23.71% 1 6,776 13.71% 1 1930 1,037 2.21% 0 12,656 26.94% 2 10,704 22.79% 1 11,666 24.83% 2 10,914 23.23% 1 1927 1,526 4.23% 0 11,614 32.17% 2 9,211 25.51% 2 9,702 26.87% 2 3,739 10.36% 0 1924 1,886 5.40% 0 7,655 21.91% 2 7,561 21.64% 1 10,638 30.44% 2 6,312 18.06% 1 1921 8,434 24.91% 2 7,362 21.74% 1 9,740 28.77% 2 6,263 18.50% 1 (Excludes compensatory seats. Figures in italics represent joint lists.)

Detailed 2020s 2025 Results of the 2025 parliamentary election held on 8 September 2025:

Party Votes % Seats Labour Party Ap 66,378 31.98% 4 0 4 Progress Party FrP 41,123 19.81% 2 0 2 Conservative Party H 25,893 12.47% 1 0 1 Socialist Left Party SV 14,265 6.87% 1 0 1 Centre Party Sp 14,026 6.76% 1 0 1 Red Party R 12,422 5.98% 0 1 1 Green Party MDG 11,953 5.76% 0 0 0 Liberal Party V 7,602 3.66% 0 0 0 Christian Democratic Party KrF 5,184 2.50% 0 0 0 Pensioners' Party PP 2,997 1.44% 0 0 0 Norway Democrats ND 1,504 0.72% 0 0 0 Industry and Business Party INP 1,252 0.60% 0 0 0 Generation Party GP 1,114 0.54% 0 0 0 Peace and Justice FOR 474 0.23% 0 0 0 Conservative K 456 0.22% 0 0 0 DNI Party DNI 367 0.18% 0 0 0 Welfare and Innovation Party VIP 347 0.17% 0 0 0 Center Party PS 224 0.11% 0 0 0Valid votes 207,581 100.00% 9 1 10Blank votes 1,770 0.84% Rejected votes – other 206 0.10% Total polled 209,557 81.22% Registered electors 258,021

The following candidates were elected: Constituency seats - Isak Veierud Busch (Ap); Trond Giske (Ap); Maren Grøthe (Sp); Lars Haltbrekken (SV); Mari Holm Lønseth (H); Anniken Refseth (Ap); Lill Harriet Sandaune (FrP); Kristine L. Solli (Ap); and Rikard Spets (FrP). Compensatory seat - Hege Bae Nyholt (R).

2021 Results of the 2021 parliamentary election held on 13 September 2021:

Party Votes % Seats Labour Party Ap 57,621 29.82% 3 0 3 Conservative Party H 31,837 16.48% 2 0 2 Centre Party Sp 29,181 15.10% 2 0 2 Socialist Left Party SV 17,635 9.13% 1 0 1 Progress Party FrP 16,650 8.62% 1 0 1 Red Party R 10,852 5.62% 0 1 1 Green Party MDG 9,268 4.80% 0 0 0 Liberal Party V 8,435 4.37% 0 0 0 Christian Democratic Party KrF 4,211 2.18% 0 0 0 Pensioners' Party PP 3,351 1.73% 0 0 0 Democrats in Norway 1,723 0.89% 0 0 0 Industry and Business Party INP 658 0.34% 0 0 0 Center Party 442 0.23% 0 0 0 Health Party 330 0.17% 0 0 0 The Christians PDK 305 0.16% 0 0 0 Capitalist Party 247 0.13% 0 0 0 Alliance - Alternative for Norway 216 0.11% 0 0 0 Pirate Party of Norway 212 0.11% 0 0 0 Communist Party of Norway K 63 0.03% 0 0 0Valid votes 193,237 100.00% 9 1 10Blank votes 1,206 0.62% Rejected votes – other 307 0.16% Total polled 194,750 78.67% Registered electors 247,553

The following candidates were elected: Constituency seats - Jorodd Asphjell (Ap); Sivert Bjørnstad (FrP); Heidi Greni (Sp); Lars Haltbrekken (SV); Eva Kristin Hansen (Ap); Linda Cathrine Hofstad Helleland (H); Kirsti Leirtrø (Ap); Mari Holm Lønseth (H); and Ola Borten Moe (Sp). Compensatory seat - Hege Bae Nyholt (R).

2010s 2017 Results of the 2017 parliamentary election held on 11 September 2017:

Party Votes % Seats Labour Party Ap 59,610 32.79% 4 0 4 Conservative Party H 37,719 20.75% 2 0 2 Progress Party FrP 21,248 11.69% 1 0 1 Centre Party Sp 19,409 10.68% 1 0 1 Socialist Left Party SV 14,008 7.71% 1 0 1 Liberal Party V 7,385 4.06% 0 1 1 Green Party MDG 7,082 3.90% 0 0 0 Red Party R 5,344 2.94% 0 0 0 Christian Democratic Party KrF 4,974 2.74% 0 0 0 Pensioners' Party PP 3,083 1.70% 0 0 0 Health Party 405 0.22% 0 0 0 Capitalist Party 368 0.20% 0 0 0 Pirate Party of Norway 361 0.20% 0 0 0 The Alliance 264 0.15% 0 0 0 The Christians PDK 225 0.12% 0 0 0 Democrats in Norway 168 0.09% 0 0 0 Coastal Party KP 143 0.08% 0 0 0Valid votes 181,796 100.00% 9 1 10Blank votes 1,171 0.64% Rejected votes – other 444 0.24% Total polled 183,411 79.03% Registered electors 232,067

The following candidates were elected: Constituency seats - Jorodd Asphjell (Ap); Sivert Bjørnstad (FrP); Trond Giske (Ap); Heidi Greni (Sp); Lars Haltbrekken (SV); Eva Kristin Hansen (Ap); Linda Cathrine Hofstad Helleland (H); Kirsti Leirtrø (Ap); and Mari Holm Lønseth (H). Compensatory seat - Jon Gunnes (V).

2013 Results of the 2013 parliamentary election held on 8 and 9 September 2013:

Party Votes % Seats Labour Party Ap 64,351 36.70% 4 0 4 Conservative Party H 38,930 22.20% 2 0 2 Progress Party FrP 23,871 13.61% 2 0 2 Centre Party Sp 11,351 6.47% 1 0 1 Socialist Left Party SV 9,992 5.70% 0 1 1 Liberal Party V 9,460 5.39% 0 0 0 Christian Democratic Party KrF 6,562 3.74% 0 0 0 Green Party MDG 5,540 3.16% 0 0 0 Red Party R 1,667 0.95% 0 0 0 Pensioners' Party PP 1,590 0.91% 0 0 0 Pirate Party of Norway 857 0.49% 0 0 0 The Christians PDK 522 0.30% 0 0 0 Democrats in Norway 210 0.12% 0 0 0 Coastal Party KP 139 0.08% 0 0 0 Christian Unity Party KSP 129 0.07% 0 0 0 Liberal People's Party DLF 98 0.06% 0 0 0 Communist Party of Norway K 97 0.06% 0 0 0Valid votes 175,366 100.00% 9 1 10Blank votes 777 0.44% Rejected votes – other 227 0.13% Total polled 176,370 79.39% Registered electors 222,149

The following candidates were elected: Constituency seats - Jorodd Asphjell (Ap); Sivert Bjørnstad (FrP); Trond Giske (Ap); Heidi Greni (Sp); Eva Kristin Hansen (Ap); Linda Cathrine Hofstad Helleland (H); Frank Jenssen (H); Per Sandberg (FrP); and Karianne Tung (Ap). Compensatory seat - Snorre Valen (SV).

2000s 2009 Results of the 2009 parliamentary election held on 13 and 14 September 2009:

Party Votes % Seats Labour Party Ap 66,614 40.98% 4 0 4 Progress Party FrP 31,885 19.62% 2 0 2 Conservative Party H 22,587 13.90% 1 0 1 Socialist Left Party SV 12,852 7.91% 1 0 1 Centre Party Sp 11,803 7.26% 1 0 1 Christian Democratic Party KrF 6,189 3.81% 0 1 1 Liberal Party V 5,871 3.61% 0 0 0 Red Party R 2,057 1.27% 0 0 0 Pensioners' Party PP 1,026 0.63% 0 0 0 Green Party MDG 834 0.51% 0 0 0 Coastal Party KP 262 0.16% 0 0 0 Christian Unity Party KSP 230 0.14% 0 0 0 Democrats in Norway 219 0.13% 0 0 0 Communist Party of Norway K 107 0.07% 0 0 0Valid votes 162,536 100.00% 9 1 10Blank votes 698 0.43% Rejected votes – other 99 0.06% Total polled 163,333 76.37% Registered electors 213,863

The following candidates were elected: Constituency seats - Jorodd Asphjell (Ap); Trond Giske (Ap); Gunn Karin Gjul (Ap); Eva Kristin Hansen (Ap); Linda Cathrine Hofstad Helleland (H); Tord Lien (FrP); Ola Borten Moe (Sp); Per Sandberg (FrP); and Snorre Valen (SV). Compensatory seat - Øyvind Håbrekke (KrF).

2005 Results of the 2005 parliamentary election held on 11 and 12 September 2005:

Party Votes % Seats Labour Party Ap 59,837 38.27% 4 0 4 Progress Party FrP 27,786 17.77% 2 0 2 Conservative Party H 19,518 12.48% 1 0 1 Socialist Left Party SV 16,764 10.72% 1 0 1 Centre Party Sp 13,228 8.46% 1 0 1 Christian Democratic Party KrF 7,610 4.87% 0 1 1 Liberal Party V 6,983 4.47% 0 0 0 Red Electoral Alliance RV 1,763 1.13% 0 0 0 Pensioners' Party PP 1,227 0.78% 0 0 0 Coastal Party KP 699 0.45% 0 0 0 Green Party MDG 360 0.23% 0 0 0 Democrats 228 0.15% 0 0 0 Christian Unity Party KSP 176 0.11% 0 0 0 Communist Party of Norway K 98 0.06% 0 0 0 Norwegian Republican Alliance 92 0.06% 0 0 0Valid votes 156,369 100.00% 9 1 10Blank votes 542 0.35% Rejected votes – other 112 0.07% Total polled 157,023 76.76% Registered electors 204,555

The following candidates were elected: