| IBLO | Keyword |
| IBLOC | Keyword |
| IBLOCK | Keyword |
| ICAS | Function |
| ICASE | Function |
| ICON | Keyword | Property |
| ID | Keyword | Function |
| IDXC | Function |
| IDXCO | Function |
| IDXCOL | Function |
| IDXCOLL | Function |
| IDXCOLLA | Function |
| IDXCOLLAT | Function |
| IDXCOLLATE | Function |
| IF | Keyword |
| IFDE | Keyword |
| IFDEF | Keyword |
| IFND | Keyword |
| IFNDE | Keyword |
| IFNDEF | Keyword |
| IIF | Function |
| IMAGE | Keyword |
| IMEMODE | Property |
| IMES | Function |
| IMEST | Function |
| IMESTA | Function |
| IMESTAT | Function |
| IMESTATU | Function |
| IMESTATUS | Function |
| IMPL | Keyword |
| IMPLE | Keyword |
| IMPLEM | Keyword |
| IMPLEME | Keyword |
| IMPLEMEN | Keyword |
| IMPLEMENT | Keyword |
| IMPLEMENTS | Keyword |
| IMPO | Keyword |
| IMPOR | Keyword |
| IMPORT | Keyword |
| IN | Keyword |
| INCL | Keyword |
| INCLU | Keyword |
| INCLUD | Keyword |
| INCLUDE | Keyword |
| INCLUDEPAGEINOUTPUT | Method |
| INCREMENT | Property |
| INCREMENTALSEARCH | Property |
| INDB | Function |
| INDBC | Function |
| INDEX | Keyword | Function |
| INDEXE | Keyword |
| INDEXES | Keyword |
| INDEXS | Function |
| INDEXSE | Function |
| INDEXSEE | Function |
| INDEXSEEK | Function |
| INDEXTOITEMID | Property |
| INFO | Keyword |
| INFOR | Keyword |
| INFORM | Keyword |
| INFORMA | Keyword |
| INFORMAT | Keyword |
| INFORMATI | Keyword |
| INFORMATIO | Keyword |
| INFORMATION | Keyword |
| INIT | Event |
| INITIALSELECTEDALIAS | Property |
| INKE | Function |
| INKEY | Function |
| INLI | Function |
| INLIS | Function |
| INLIST | Function |
| INNE | Keyword |
| INNER | Keyword |
| INPUT | Keyword | Function |
| INPUTB | Function |
| INPUTBO | Function |
| INPUTBOX | Function |
| INPUTMASK | Property |
| INS | Keyword |
| INSE | Keyword |
| INSER | Keyword |
| INSERT | Keyword |
| INSERTCMD | Property |
| INSERTCMDDATASOURCE | Property |
| INSERTCMDDATASOURCETYPE | Property |
| INSERTCMDREFRESHCMD | Property |
| INSERTCMDREFRESHFIELDLIST | Property |
| INSERTCMDREFRESHKEYFIELDLIST | Property |
| INSM | Function |
| INSMO | Function |
| INSMOD | Function |
| INSMODE | Function |
| INST | Keyword |
| INSTR | Keyword |
| INSTRU | Keyword |
| INSTRUC | Keyword |
| INSTRUCT | Keyword |
| INT | Keyword | Function |
| INTE | Keyword |
| INTEG | Keyword |
| INTEGE | Keyword |
| INTEGER | Keyword |
| INTEGRALHEIGHT | Property |
| INTEN | Keyword |
| INTENS | Keyword |
| INTENSI | Keyword |
| INTENSIT | Keyword |
| INTENSITY | Keyword |
| INTERACTIVECHANGE | Event |
| INTERVAL | Property |
| INTO | Keyword |
| IS | Keyword |
| ISAL | Function |
| ISALP | Function |
| ISALPH | Function |
| ISALPHA | Function |
| ISATTRIBUTE | Property |
| ISBASE64 | Property |
| ISBINARY | Property |
| ISBL | Function |
| ISBLA | Function |
| ISBLAN | Function |
| ISBLANK | Function |
| ISCO | Function |
| ISCOL | Function |
| ISCOLO | Function |
| ISCOLOR | Function |
| ISDI | Function |
| ISDIFFGRAM | Property |
| ISDIG | Function |
| ISDIGI | Function |
| ISDIGIT | Function |
| ISEX | Function |
| ISEXCL | Function |
| ISEXCLU | Function |
| ISEXCLUS | Function |
| ISEXCLUSI | Function |
| ISEXCLUSIV | Function |
| ISEXCLUSIVE | Function |
| ISFL | Function |
| ISFLOC | Function |
| ISFLOCK | Function |
| ISFLOCKE | Function |
| ISFLOCKED | Function |
| ISHO | Function |
| ISHOS | Function |
| ISHOST | Function |
| ISHOSTE | Function |
| ISHOSTED | Function |
| ISLE | Function |
| ISLEA | Function |
| ISLEAD | Function |
| ISLEADB | Function |
| ISLEADBY | Function |
| ISLEADBYT | Function |
| ISLEADBYTE | Function |
| ISLO | Function |
| ISLOADED | Property |
| ISLOW | Function |
| ISLOWE | Function |
| ISLOWER | Function |
| ISMA | Function |
| ISMAR | Function |
| ISMARK | Function |
| ISMARKE | Function |
| ISMARKED | Function |
| ISME | Function |
| ISMEM | Function |
| ISMEMO | Function |
| ISMEMOF | Function |
| ISMEMOFE | Function |
| ISMEMOFET | Function |
| ISMEMOFETC | Function |
| ISMEMOFETCH | Function |
| ISMEMOFETCHE | Function |
| ISMEMOFETCHED | Function |
| ISMO | Function |
| ISMOU | Function |
| ISMOUS | Function |
| ISMOUSE | Function |
| ISNU | Function |
| ISNUL | Function |
| ISNULL | Function |
| ISOM | Keyword |
| ISOME | Keyword |
| ISOMET | Keyword |
| ISOMETR | Keyword |
| ISOMETRI | Keyword |
| ISOMETRIC | Keyword |
| ISPE | Function |
| ISPEN | Function |
| ISRE | Function |
| ISREAD | Function |
| ISREADO | Function |
| ISREADON | Function |
| ISREADONL | Function |
| ISREADONLY | Function |
| ISRL | Function |
| ISRLO | Function |
| ISRLOC | Function |
| ISRLOCK | Function |
| ISRLOCKE | Function |
| ISRLOCKED | Function |
| ISTR | Function |
| ISTRA | Function |
| ISTRAN | Function |
| ISTRANS | Function |
| ISTRANSA | Function |
| ISTRANSAC | Function |
| ISTRANSACT | Function |
| ISTRANSACTA | Function |
| ISTRANSACTAB | Function |
| ISTRANSACTABL | Function |
| ISTRANSACTABLE | Function |
| ISUP | Function |
| ISUPP | Function |
| ISUPPE | Function |
| ISUPPER | Function |
| ITAL | Keyword |
| ITALI | Keyword |
| ITALIA | Keyword |
| ITALIAN | Keyword |
| ITEM | Method |
| ITEMBACKCOLOR | Property |
| ITEMDATA | Property |
| ITEMFORECOLOR | Property |
| ITEMIDDATA | Property |
| ITEMIDTOINDEX | Method |
| ITEMTIPS | Property |
| ITSE | Keyword |
| ITSEX | Keyword |
| ITSEXP | Keyword |
| ITSEXPR | Keyword |
| ITSEXPRE | Keyword |
| ITSEXPRES | Keyword |
| ITSEXPRESS | Keyword |
| ITSEXPRESSI | Keyword |
| ITSEXPRESSIO | Keyword |
| ITSEXPRESSION | Keyword |
| IXMLDOMELEMENT | Property |