The Manzanita Lake Naturalist's Services Historic District encompasses the historic area devoted to visitor interpretation services at the northwest entrance of Lassen Volcanic National Park in northeastern California.

The 1927 Loomis Museum and its seismograph hut were built by the Loomises and were donated, together with 40 acres (16 ha) of land to the National Park Service in 1929.

[3][4] Park Service structures were developed at Manzanita Lake in the 1930s.

The naturalist's residence (1933) shares a similar design to its counterparts at Crater Lake National Park, with their design and construction techniques adapted to the short building seasons prevalent at both parks.

In 1987 a reassessment indicated that such a rockfall could not reach Manzanita Lake and the area was reoccupied and renovated.