Libraries established in 1921

The Università Cattolica del Sacro Cuore Library was established (founded) in 1921 by Agostino Gemelli, who based its design and organisation on that of highly prestigious foreign libraries. All the libraries of the four UCSC campuses (Milan, Brescia, Piacenza-Cremona and Rome) use a centralized general catalogue.

Clearview Public Library is a public library serving the residents of the Township of Clearview, Simcoe County, Ontario, Canada, and through contracts to the residents of the adjoining townships of Adjala–Tosorontio, Simcoe County, and Mulmur, Dufferin County. Library branches are located in the communities of Stayner, Creemore and New Lowell. A drop box is located in the community of Nottawa.

The John G. McCullough Free Library is a library located in the village of North Bennington, Vermont. Established in 1921, the library is a member of the Catamount Library Network, a consortium of Vermont libraries with shared catalog and lending resources. The library serves North Bennington, Bennington, Shaftsbury, and surrounding towns.

The Monacensia, or Monacensia in Hildebrandhaus, is the literary archive and a research library of the city of Munich, the capital of Bavaria, Germany, which is devoted to preserving and providing public access to the city's cultural history. The name Monacensia is derived from the Latin name for Munich.

Tarbiat Library (Persian: کتابخانه تربیت) is the first state library constructed in Iran, established in 1921 at Tabriz. The library was founded by Mahammad Ali Tarbiat, an Iranian journalist and politician, as the "Ma'aref public library and reading room" (Persian: كتابخانه و قرائتخانه عمومي معارف) which was later renamed after its founder to Tarbiat Library.

Camden County Library is a county library system located in Camden County, New Jersey. It is headquartered in Voorhees, New Jersey.

Mongolian National Library (Mongolian: Монгол Улсын Үндэсний Номын Сан) located in Sükhbaatar District, Ulaanbaatar, is the largest and oldest library in Mongolia. It houses over three million books and publications, one million of which are rare and valuable books, sutras and manuscripts, including the world's only surviving copies of many ancient Buddhist texts.

The Dhaka University Library is the central library of the University of Dhaka which started in 1921 with a collection of eighteen thousand books received from Dhaka College and Law College. The Library now has over six lakh eighty thousand (680,000) books and journals. Moreover, it has around thirty thousand rare manuscripts. Dhaka University Library is the largest in the country.

Farmington Public Library is a public library system in San Juan County, New Mexico.

The Lebanese National Library (Arabic: المكتبة الوطنية), located in Beirut, is the national library of Lebanon. It closed to the public in 1979 due to the Lebanese Civil War, and its surviving collections were placed in storage. Restoration of its volumes and planning for a new site began in 1999.