This list is intended to include all significant botanical gardens and arboretums in the U.S. state of Illinois.
| Name | Image | Affiliation | City |
|---|
|
| Anderson Japanese Gardens | Rockford |
| Cantigny Park | Wheaton |
| Chicago Botanic Garden | Glencoe |
| Fell Arboretum | Illinois State University | Normal |
| The Gardens at SIUE | Southern Illinois University | Edwardsville |
| Garfield Park Conservatory | Chicago |
| Mabery Gelvin Botanical Garden | Mahomet |
| Heritage Gardens | Midway Village Museum | Rockford |
| Kaskaskia College Arboretum | Kaskaskia College | Centralia |
| Klehm Arboretum and Botanic Garden | Rockford |
| La Paloma Gardens | Rockford |
| Ladd Arboretum | Evanston |
| Lilacia Park | Lombard |
| Lincoln Memorial Gardens | Springfield |
| Lincoln Park Conservatory | Chicago |
| Longview Park Conservatory and Gardens | Rock Island |
| George L. Luthy Memorial Botanical Garden | Peoria |
| Morton Arboretum | Lisle |
| Nicholas Conservatory and Gardens | Rockford |
| Oak Park Conservatory | Oak Park |
| Don Opel Arboretum | Highland Community College | Freeport |
| Quad City Botanical Center | Rock Island |
| Sinnissippi Gardens | Rockford |
| Standish Park Arboretum | Galesburg |
| Starhill Forest Arboretum | Petersburg |
| Tinker Swiss Cottage and Gardens | Rockford |
| University of Chicago Botanic Garden | University of Chicago | Chicago |
| University of Illinois Arboretum | University of Illinois | Urbana |
| University of Illinois Conservatory and Plant Collection | University of Illinois | Urbana |
| Washington Park (Springfield) | Springfield |
| Wilder Park Conservatory | Elmhurst |