Humboldt University (OKZ: 00)
- President / Vice-Presidents (OKZ: 0100)
- University Administration (OKZ: 02)
- Administrative Bodies and Committees (OKZ: 03)
- Faculty of Law (OKZ: 10)
- Faculty of Life Sciences (OKZ: 21)
- Faculty of Mathematics and Natural Sciences (OKZ: 33)
  Dean / Deputy Dean (OKZ: 3301)
  
  Faculty Management (OKZ: 3302)
  
  Department of Chemistry (OKZ: 3311)
  
  Department of Geography (OKZ: 3312)
  
  Department of Computer Science (OKZ: 3313)
  
  Department of Mathematics (OKZ: 3314)
  
  Head of Department (OKZ: 331401)
  
  Section Pure Mathematics / Chairs (OKZ: 331410)
  
  Mathematiical applications of string theory (OKZ: 331429)
  
  Section Applied Mathematics / Chairs (OKZ: 331430)
  
  Section Stochastics / Chairs (OKZ: 331450)
  
  Stochastics (OKZ: 331459)
  
  Section Didactics of Mathematics / Chairs (OKZ: 331460)
  
  additional Sections / Chairs (OKZ: 331470)
  
  Non smooth optimization (OKZ: 331477)
  
  Technical Support and Services (OKZ: 331490)
  
  IT Department (OKZ: 331491)
  
  Department of Physics (OKZ: 3315)
- Faculty of Humanities (OKZ: 51)
- Faculty of Language, Literature and Humanities (OKZ: 52)
- Faculty of Humanities and Social Sciences (OKZ: 55)
- Faculty of Theology (OKZ: 60)
- Faculty of Economics and Business Administration (OKZ: 70)
- Center for the Science of Materials Berlin (OKZ: 81)
- Centre for British Studies (OKZ: 82)
- Central Institute Professional School of Education (OKZ: 83)
- Hermann von Helmholtz-Centre for Cultural Techniques (OKZ: 84)
- Integrative Research Institutes (OKZ: 85)
- Excellency Cluster (OKZ: 86)
- Humboldt Graduate School (OKZ: 87)
- Interdisciplinary Research Centres (OKZ: 88)
- Other Interdisciplinary Units (OKZ: 89)
- Central Unit - Language Centre (OKZ: 91)
- Central Unit - University Library (OKZ: 92)
- Central Unit - Computer and Media Service (OKZ: 93)
- Central Unit - Sport and Recreation (OKZ: 94)
- additional Central Institutes (OKZ: 96)
- Institutes "within" the Humboldt-Universität zu Berlin and Non-affiliated Units (OKZ: 99)