Altheimer (/ˈɑːl.taɪmər/ ALL-timer) is a city in Plum Bayou Township, Jefferson County, Arkansas, United States.

[6] Altheimer is part of the Timberlands Region, an area rich in natural resources that was discovered by pioneers from the eastern states in the early 19th century.

U.S. Route 63/79 runs along the northwestern edge of the city, leading southwest to Pine Bluff and northeast 11 miles (18 km) to Humphrey.

The city was named for brothers Joseph and Louis Altheimer, two Pine Bluff merchants.

[8] Louis, who was born in Eberstadt in 1850, read stories by German adventurer Frederick Gerstacker telling of the rich natural resources in Arkansas, and left for America as a teenager, eventually settling in Pine Bluff.

Joseph's son, Benjamin, became a successful attorney, establishing the prominent Chicago law firm of Altheimer, Mayer, Woods, and Smith (later known as Altheimer & Gray), and serving twice as president of Chicago's Iroquois Club, the city's oldest Democratic Party political club.

One of the most prominent locations is The Elms, a former plantation house on the Collier Estate built in 1886, renovated by Ben Altheimer in the 1930s.

Listed on the National Register of Historic Places, The Elms is open to the public for retreats, family reunions and tours.

[12] Also located on the property are the Elms Duck Lodges, which provides hunting and fishing in the private lake and pond.

[7] Roselawn, also known as the Collier-Barnett House, was built in 1875 and added to National Register of Historic Places in 1978.

Altheimer mayor Zola Hudson stated a desire for the city government to repurpose the building.

[29] The exception was with the pre-kindergarten levels, as all PBSD areas are now assigned to Forrest Park/Greenville School, including the territory from the former Dollarway district.