| B. Heller & Co. Collection |
| Baer, Joseph Louis. Papers |
| Bakwin, Dr. Harry and Dr. Ruth Morris Bakwin. Soviet Posters. Collection |
| Balderston, John L., Jr. Collection |
| Baldridge, Cyrus Leroy. Papers |
| Baldwin, Loammi. Papers |
| Balzac Research Collection of E. Preston Dargan |
| Bandettini, Teresa. Poems (Ms 1445) |
| Baptist Ministers' Conference, Chicago. Records |
| Baptist Theological Faculties Union. Records |
| Baptist Theological Union. Records |
| Baptist Union Theological Seminary. Records |
| Barnard. Edward Emerson. Papers |
| Barnes, Broda Otto Papers |
| Barnes, David Leonard. Iron & Steel in Car Construction: Memoranda on Pressed Steel |
| Barnes, David Leonard. Specifications for Locomotive Details |
| Barron, Elwyn A. Papers |
| Barrows, Harlan H. Papers |
| Barrows, Samuel J., Papers |
| Bartky, Walter, Papers |
| Bartlett, Frederick. Recipe for Pills |
| Bartolozzi, Francesco. Collection |
| Barzi, Benedetto, and Angelo Gambiglioni, Rubricae. Manuscript (Ms 8) |
| Bastin, Edson Sunderland. Papers |
| Baur, E. Jackson. Papers |
| Bay, J. Christian. Alphabetical Index to The Birds of America by John James Audubon |
| Bay, Jens Christian. Scrapbook on Pulitzer Prizes in Journalism |
| Beadle, George Wells. Papers |
| Beaumont, William. Collection |
| Beaver, R. Pierce. Papers |
| Becker, Hans Karl. Schriften zur Höhlenkunde |
| Bekker, Immanuel. Papers |
| Belfield, Henry H. and Belfield Family. Papers |
| Bell, Laird. Papers |
| Bellow, Saul. Papers |
| Bennett, A. Milo. Papers |
| Benon, Raoul. Titres en Travaux du Docteur R. Benon |
| Benton, William. Papers |
| Berelson, Bernard R., Study of Graduate Education. Records |
| Bernard of Clairvaux, De consideratione. Manuscript (Ms 9) |
| Bernard, Claude. Dessins originaux pour le Précis iconographique de médecine opératoire et d'anatomie chirurgicale, par C. Bernard et Ch. Huette |
| Bernard, Luther Lee. Papers |
| Bernstein, Seymour. Papers |
| Berthollet, Claude Louis. Rapport sur une mémoire de M. Cluzel ayant pour object l'analyse du soufre liquide de Lampadius |
| Bewick, Thomas. Wood Blocks |
| Bibfeldt, Franz. Papers |
| Bibliotheca Riviana sive Catalogus Librorum |
| Bickham Family. Papers |
| Bickham, Martin Hayes. Papers |
| Bigelow, Harry A. Papers |
| Billings, Frank. Papers |
| Billings, John S. Letter |
| Bjerrum, Jannik. Two papers on Glaucoma |
| Blair, James. Collection |
| Blakemore, William Barnett. Papers |
| Blatchford, E.W. Hog Raising and the Pork Packing Industry in America |
| Blayney, James Roy. Papers |
| Blind, Karl. Collection |
| Block, Jean F. Papers |
| Bloom, William. Papers |
| Bloomfield, Leonard, and Clarence L. Barnhart. Collection |
| Bloomfield, Leonard. Papers |
| Blum, Walter J. Papers |
| Boerhaave, Herman. Supplementa Dictatis in Institutiones & Aphorismos Boerhaavii, Notes on |
| Bogorad, Lawrence. Papers |
| Bohr, Niels. Collection |
| Bonner, Amy. Papers |
| Bonney Family. Correspondence |
| Boot, George William. The Diagnosis of Osteosclerosis |
| Bothman, Louis. Papers |
| Bowman, Mary Jean. Papers |
| Boynton, Percy. Papers |
| Bradbury, Dorothy Edith. Papers |
| Bradford, Amory H. Papers |
| Brainerd, Mary Bowen. Papers |
| Braude, Marjorie. Papers |
| Brauer, Jerald. Papers |
| Braxton, Anthony. Collection |
| Bray, George Eben. Equipment for Drying Fruits and Vegetables Which can be Made at Home |
| Breckinridge, Sophonisba P. Papers |
| Bressie, Ramona. Papers |
| Bretonière, J. Sailing Flight, from Observations Made at Constantine, Algeria |
| Bretz, J Harlen. Papers |
| Briggs, Lloyd Vernon. Sanity Hearings and Criminal Cases of Clarence V.T. Richeson, Leon F. Czolgosz, and Bertram C. Spencer |
| British Lottery Handbills |
| British Romance Novelettes and Popular Paperbacks. Collection |
| Brooks, Shirley. Collection |
| Broussais, François Joseph Victor. Pathologie Interne, [and] Physiologie. Lecture Notes |
| Brown, Edward K. Papers |
| Brown, Frieda S. Papers |
| Brown, Rachel Fuller. Notebooks |
| Brownlow, Louis. Diaries |
| Bryan, Charles W., Jr. Collection |
| Buitenen, J. A. B. van. Papers |
| Bulletin of the Atomic Scientists. Records |
| Bunting, Sir Percy William. Papers |
| Burgess, Ernest Watson. Papers |
| Burgess, Ernest Watson. Papers. Addenda |
| Burlingam, D. E., Notes on lectures at Chicago Medical College, Mercy Hospital, and Cook County Hospital |
| Burroughs, John. The Flight of Birds |
| Burrows, William. Papers |
| Burton, Ernest DeWitt. Papers |
| Butler, Demia. Papers |
| Butler, Digby B. Papers |
| Butler-Gunsaulus. Collection |
| Buzzell, Edgar A. Collection |
| Byrne, John. Clinical Notes on the Electric Cautery in Uterine Surgery |