Lyndon B. Johnson (LBJ) National Grassland is a national grassland located in the Great Plains of the northern part of the U.S. state of Texas near Decatur, and within an hour's drive from Fort Worth.

It is primarily used for recreation, such as hiking, camping, horseback riding, fishing, and hunting.

Named after former U.S. president Lyndon B. Johnson, the park is located primarily in the northern part of Wise County, but a small portion extends northward into southern Montague County.

The units include Angelina, Davy Crockett, Sabine, and Sam Houston National Forests, plus Caddo National Grassland and Lyndon B. Johnson.

Local ranger district offices are located in Decatur.