As with many new fields that cross traditional disciplinary lines, nanotechnology does not fit neatly into any one Library of Congress classification number. Some of the key classifications for nanotechnology works include the following:
| HD 9999 .N36-.N364 | Nanostructured materials industry |
| QC 176.8 .M5 | Solid state physics, micromechanics |
| QC 176.8 .N35 | Solid state physics, nanomechanics, nanostructures |
| QC611.8.N33 | Nanocrystals |
| R 856 | Biomedical engineering (includes general medical applications of nanotechnology) |
| R 857 .B54 | Biosensors (nanotechnology finds wide application here.) |
| RS201.N35 | Nanoparticles in medicine |
| T 174.7 | Nanotechnology (was: Technological change) |
| TA 418.9 .N35 | Nanostructured materials |
| TA 418.9 .S62 | "Smart" materials |
| TA 1530 | Nanophotonics |
| TK 7874.8 | Molecular electronics |
| TK 7874.84 | Nanoelectronics |
| TK 7874.85 | Nanowires |
| TK 7874.88 | Quantum dots |
| TK 7875 .M52 | Microelectromechanical systems |
| TK 7875 .N373 | Nanoelectromechanical systems |
As for Library of Congress subject headings, relevant headings listed below are currently in use:
