The 2003 Hessian state election was held on 2 February 2003 to elect the members of the Landtag of Hesse. The incumbent coalition government of the Christian Democratic Union (CDU) and Free Democratic Party (FDP) led by Minister-President Roland Koch was returned with an increased majority. The CDU recorded a 5.4% swing in its favour, winning an absolute majority of seats. It subsequently formed government alone, with Roland Koch continuing in office.
The table below lists parties represented in the previous Landtag of Hesse.
|- ! rowspan=2 colspan=2| Party ! colspan=3| Constituency ! colspan=4| Party list ! rowspan=2| Total<br>seats ! rowspan=2| +/- |- ! Votes ! % ! Seats ! Votes ! % ! +/- ! Seats |- | bgcolor=| | align=left| Christian Democratic Union | 1,411,800 | 51.99 | 53 | 1,333,863 | 48.77 | +5.36 | 3 | 56 | 6 |- | bgcolor=| | align=left| Social Democratic Party | 898,813 | 33.10 | 2 | 795,576 | 29.09 | -10.28 | 31 | 33 | 13 |- | bgcolor=| | align=left| Alliance 90/The Greens | 230,261 | 8.48 | 0 | 276,276 | 10.10 | +2.92 | 12 | 12 | 4 |- | bgcolor=| | align=left| Free Democratic Party | 148,632 | 5.47 | 0 | 216,110 | 7.90 | +2.80 | 9 | 9 | 3 |- | bgcolor=| | align=left| The Republicans | 7,025 | 0.26 | 0 | 34,563 | 1.26 | -1.42 | 0 | 0 | 0 |- | bgcolor=| | align=left| Human Environment Animal Protection Party | 4,815 | 0.18 | 0 | 20,600 | 0.75 | +0.29 | 0 | 0 | 0 |- | | align=left| Airport Expansion Opponents | colspan=3| â | 17,736 | 0.65 | New | 0 | 0 | New |- | bgcolor=| | align=left| Party for a Rule of Law Offensive | 3,074 | 0.11 | 0 | 14,545 | 0.53 | New | 0 | 0 | New |- | bgcolor=| | align=left| Feminist Party of Germany | 1,090 | 0.04 | 0 | 7,506 | 0.27 | +0.04 | 0 | 0 | 0 |- | bgcolor=| | align=left| Party of Bible-abiding Christians | 1,465 | 0.05 | 0 | 6,674 | 0.24 | +0.07 | 0 | 0 | 0 |- | bgcolor=| | align=left| German Communist Party | 2,552 | 0.09 | 0 | 5,908 | 0.22 | +0.08 | 0 | 0 | 0 |- | bgcolor=| | align=left| Ecological Democratic Party | 378 | 0.01 | 0 | 2,683 | 0.10 | +0.02 | 0 | 0 | 0 |- | bgcolor=| | align=left| Civil Rights Movement Soliarity | 873 | 0.03 | 0 | 1,643 | 0.06 | +0.04 | 0 | 0 | 0 |- | bgcolor=| | align=left| Socialist Equality Party | colspan=3| â | 1,309 | 0.05 | New | 0 | 0 | New |- | bgcolor=| | align=left| Independents | 4,555 | 0.17 | 0 | colspan=4| â | 0 | 0 |- | bgcolor=| | align=left| Socialist Alternative | 356 | 0.01 | 0 | colspan=4| â | 0 | New |- class="sortbottom" ! colspan=2| Total ! 2,715,689 ! 100.00 ! 55 ! 2,734,992 ! 100.00 ! ! 55 ! 110 ! 0 |- | colspan=2 align=center| Invalid | 82,845 | 2.96 | | 63,542 | 2.27 | colspan=4| |- ! colspan=2| Turnout ! 2,798,534 ! 64.62 ! ! 2,798,534 ! 64.62 ! -1.83 ! colspan=4| |- | colspan=2 align=center| Registered voters | 4,330,792 | colspan=2| | 4,330,792 | colspan=5|