| Icelandic | Text.LaTeX.Packages.Babel |
| IGAngle | Text.LaTeX.Packages.Graphicx |
| IGClip | Text.LaTeX.Packages.Graphicx |
| IGHeight | Text.LaTeX.Packages.Graphicx |
| IGOption | Text.LaTeX.Packages.Graphicx |
| IGPage | Text.LaTeX.Packages.Graphicx |
| IGScale | Text.LaTeX.Packages.Graphicx |
| IGTrim | Text.LaTeX.Packages.Graphicx |
| IGWidth | Text.LaTeX.Packages.Graphicx |
| Ilmenau | Text.LaTeX.Packages.Beamer |
| importGeometry | Text.LaTeX.Packages.Geometry |
| In | Text.LaTeX.Base.Syntax, Text.LaTeX.Base.Types, Text.LaTeX.Base, Text.LaTeX |
| include | Text.LaTeX.Base.Commands, Text.LaTeX.Base, Text.LaTeX |
| includegraphics | Text.LaTeX.Packages.Graphicx |
| indent | Text.LaTeX.Base.Commands, Text.LaTeX.Base, Text.LaTeX |
| infty | Text.LaTeX.Packages.AMSMath |
| input | Text.LaTeX.Base.Commands, Text.LaTeX.Base, Text.LaTeX |
| inputenc | Text.LaTeX.Packages.Inputenc |
| institute | Text.LaTeX.Base.Commands, Text.LaTeX.Base, Text.LaTeX |
| integral | Text.LaTeX.Packages.AMSMath |
| integralFromTo | Text.LaTeX.Packages.AMSMath |
| in_ | Text.LaTeX.Packages.AMSMath |
| iota | Text.LaTeX.Packages.AMSMath |
| IsString | Text.LaTeX.Base.Render, Text.LaTeX.Base, Text.LaTeX |
| Italian | Text.LaTeX.Packages.Babel |
| item | Text.LaTeX.Base.Commands, Text.LaTeX.Base, Text.LaTeX |
| itemize | Text.LaTeX.Base.Commands, Text.LaTeX.Base, Text.LaTeX |