| Election Name: | 1788 Polish-Lithuanian Sejm election |
| Flag Image: | File:Royal Banner of Stanisław II of Poland.svg |
| Type: | legislative |
| Ongoing: | no |
| Previous Election: | 1786 Polish-Lithuanian legislative election |
| Previous Year: | 1786 |
| Elected Members: | elected members |
| Next Election: | 1790 Polish-Lithuanian legislative election |
| Next Year: | 1790 |
| Seats For Election: | All 177 seats in the Chamber of Deputies 89 seats were needed for a majority |
| Leader1: | Michał Jerzy Poniatowski |
| Party1: | Patriotic Party |
| Color1: | 008904 |
| Leaders Seat1: | Did not stand |
| Seats1: | 93 |
| Leader2: | Stanisław Szczęsny Potocki |
| Party2: | Hetmans' Party |
| Color2: | FFA500 |
| Leaders Seat2: | Did not stand |
| Seats2: | 68 |
| Marshal | |
| Before Election: | Stanisław Kostka Gadomski |
| Before Party: | Pro-Prussia Party |
| After Election: | Stanisław Małachowski |
| After Party: | Patriotic Party |
The 1788 election held in the Polish–Lithuanian Commonwealth marked one of the most crucial events in the history of both countries prior to 1795. The elections returned a significant pro-reform camp to the Sejm of the Polish–Lithuanian Commonwealth chosen to repair the Commonwealth's political system and prevent the country from collapsing. The Sejm that emerged as a result of the election has been dubbed the Great Sejm.
The election was called by the King in May 1788 and the Sejmiks gathered to elect the deputies in August. The Sejm gathered on 28 September.
| Constituency | Voivodeship | Deputies | ||
|---|---|---|---|---|
| 1 | Kraków | Kraków | 8 | |
| 2 | Poznań | Poznań | 8 | |
| 3 | Vilnius | Vilnius | 2 | |
| 4 | Ashmyany | Vilnius | 2 | |
| 5 | Lida | Vilnius | 2 | |
| 6 | Vilkmergė | Vilnius | 2 | |
| 7 | Braslaw | Vilnius | 2 | |
| 8 | Sandomierz | Sandomierz | 7 | |
| 9 | Kalisz | Kalisz | 8 | |
| 10 | Trakai | Trakai | 2 | |
| 11 | Hrodna | Trakai | 2 | |
| 12 | Kaunas | Trakai | 2 | |
| 13 | Upytė | Trakai | 2 | |
| 14 | Sieradz | Sieradz | 4 | |
| 15 | Wieluń | Sieradz | 2 | |
| 16 | Łęczyca | Łęczyca | 4 | |
| 17 | Samogitia | Samogitia | 6 | |
| 18 | Brześć Kujawski | Brześć Kujawski | 2 | |
| 19 | Kiev | Kiev | 6 | |
| 20 | Inowrocław | Inowrocław | 4 | |
| 21 | Chełm | Ruthenia | 2 | |
| 22 | Volhynia | Volhynia | 6 | |
| 23 | Podolia | Podolia | 6 | |
| 24 | Smolensk | Smolensk | 4 | |
| 25 | Lublin | Lublin | 6 | |
| 26 | Polotsk | Polotsk | 2 | |
| 27 | Navahrudak | Navahrudak | 2 | |
| 28 | Slonim | Navahrudak | 2 |
| Constituency | Voivodeship | Deputies | |
|---|---|---|---|
| 29 | Vawkavysk | Navahrudak | 2 |
| 30 | Płock | Płock | 4 |
| 31 | Vitebsk | Vitebsk | 2 |
| 32 | Czersk | Masovia | 2 |
| 33 | Warsaw | Masovia | 2 |
| 34 | Wizna | Masovia | 2 |
| 35 | Wyszogród | Masovia | 2 |
| 36 | Zakroczym | Masovia | 2 |
| 37 | Ciechanów | Masovia | 2 |
| 38 | Łomża | Masovia | 2 |
| 39 | Różan | Masovia | 2 |
| 40 | Liw | Masovia | 2 |
| 41 | Nur | Masovia | 2 |
| 42 | Drohiczyn | Podlachia | 2 |
| 43 | Bielsk Podlaski | Podlachia | 2 |
| 44 | Mielnik | Podlachia | 2 |
| 45 | Rawa Mazowiecka | Rawa Mazowiecka | 2 |
| 46 | Sochaczew | Rawa Mazowiecka | 2 |
| 47 | Gostynin | Rawa Mazowiecka | 2 |
| 48 | Brest-Litovsk | Brest-Litovsk | 2 |
| 49 | Pinsk | Brest-Litovsk | 2 |
| 50 | Bratslav | Bratslav | 6 |
| 51 | Minsk | Minsk | 2 |
| 52 | Mazyr | Minsk | 2 |
| 53 | Rechytsa | Minsk | 2 |
| 54 | Livonia | Livonia | 6 |
| 55 | Chernihiv | Chernihiv | 4 |
| -- | Total | -- | 177 |