Hot Spring County is a county located in the U.S. state of Arkansas. As of the 2000 census, the population was 30,353. The county seat is Malvern. Hot Spring County was formed on November 2, 1829, from a portion of Clark County, and named for the hot springs at Hot Springs, Arkansas, which were within the borders of the county at the time. It is an alcohol prohibition or dry county.

Hot Spring County is one of 75 counties in Arkansas. The county was named for the springs located within its former boundaries. (When Garland County was established, the springs fell within the new county) The estimated population in 2004 was 30,627. This was an increase of .90% from the 2000 census.

Hot Spring County was created on 2 November 1829 and was formed from Clark County. It was named for the springs that were in its boundaries. The first county seat was at Rockport until 1879 when it moved to Malvern. The timber industry played a large part in Hot Spring County history.