Masovian Regional Assembly
The Masovian Regional Assembly is the regional legislature of the Voivodeship of Masovia in Poland. It is a unicameral parliamentary body consisting of fifty-one councillors, making it the largest provincial assembly in the republic. All councillors are chosen during regional elections for a five-year term. The current chairperson of the legislature is Ludwik Rakowski of the KO.
The assembly elects the executive board that acts as the collective executive for the provincial government, headed by the voivodeship marshal. The current Executive Board of Masovia is a coalition government between the Civic Coalition and Polish People's Party under the leadership of Marshal Adam Struzik of the PSL.
The assembly convenes at the Palace of the Treasury Minister in Warsaw.
Districts
Members of the Assembly are elected from five districts, serve five-year terms. Districts does not have the constituencies formal names. Instead, each constituency has a number and territorial description.| Number | Seats | City counties | Land counties |
| 1 | 5 | Part of Warsaw | This is list of Warsawian districts: Ursynów, Wilanów, Śródmieście, Mokotów |
| 2 | 6 | Part of Warsaw | This is list of Warsawian districts: Bemowo, Bielany, Ursus, Włochy, Ochota, Wola, Żoliborz |
| 3 | 6 | Part of Warsaw | This is list of Warsawian districts: Białołęka, Rembertów, Targówek, Wawer, Wesoła, Praga Północ, Praga Południe |
| 4 | 9 | Płock | Ciechanów, Gostynin, Mława, Płock, Płońsk, Przasnysz, Pułtusk, Sierpc, Sochaczew, Żuromin, Żyrardów |
| 5 | 7 | Radom | Białobrzegi, Grójec, Kozienice, Lipsko, Przysucha, Radom, Szydłowiec, Zwoleń |
| 6 | 9 | Ostrołęka, Siedlce | Garwolin, Łosice, Maków, Mińsk, Ostrołęka, Ostrów Mazowiecka, Siedlce, Sokołów, Węgrów, Wyszków |
| 7 | 9 | None | Grodzisk Mazowiecki, Legionowo, Nowy Dwór Mazowiecki, Otwock, Piaseczno, Pruszków, Warsaw West, Wołomin |