| Interface | Description |
 | IAboveAverage | Represents a conditional format for above or below average values. |
 | IAreas | Represents a collection of ranges, each of which represent a single contiguous range of one or more cells. |
 | IAutoFilter | Represents the autofilter options of a worksheet. |
 | IBorder | Represents the color, style, and weight of a border. |
 | IBorders | Represents the border color, border style, and border weight of a cell or range of cells. |
 | IBuiltinDocumentProperties | Represents a collection of built-in document properties associated with a workbook. |
 | ICharacters | Represents the font and text of a range of characters in a text cell or shape. |
 | IChartSheet | Represents a chart sheet. |
 | IChartSheets | Represents a collection of chartSheets in a workbook. |
 | IChartSheetWindowInfo | Represents chart sheet specific window information. |
 | IChartSheetWindowInfos | Represents a collection of IChartSheetWindowInfo instances in a chart sheet. |
 | IColors | Represents the color palette of a workbook. |
 | IColorScale | Represents a conditional format which uses color scales. |
 | IColorScaleCriteria | Represents the collection of criteria for a conditional format which uses color scales. |
 | IColorScaleCriterion | Represents an individual criterion for a conditional format which uses color scales. |
 | IColorStop | Represents an individual color stop for a gradient fill. |
 | IColorStops | Represents the collection of color stops for a gradient fill. |
 | IComment | Represents a cell comment. |
 | IComments | Represents the collection of cell comments for a worksheet. |
 | IConditionValue | Represents the minimum or maximum condition value of a conditional format. |
 | IDatabar | Represents a conditional format which uses data bars. |
 | IDataBarBorder | Represents the border of a data bar conditional format. |
 | IDialogSheet | Represents a dialog sheet in a workbook. |
 | IDocumentProperties | Represents a collection of built-in or custom document properties associated with a workbook. |
 | IDocumentProperty | Represents a built-in or custom document property associated with a workbook. |
 | IFactory | Represents a factory which created a workbook set and all of the objects contained by the workbook set. |
 | IFactoryChild | Represents an object which was directly or indirectly created by a SpreadsheetGear.IFactory . |
 | IFilter | Represents an individual filter associated with a set of autofilters. |
 | IFilters | Represents the collection of filters associated with the autofilter of a worksheet. |
 | IFont | Represents the font of a cell, range or object. Setting the properties of an instance of IFont modifies the font properties of the represented cell, range or object. |
 | IFormatColor | Represents the colors used by color scale and data bar conditional formats. |
 | IFormatCondition | Represents a conditional format. |
 | IFormatConditions | Represents the conditional formats associated with a range. |
 | IGradient | Represents the ILinearGradient or IRectangularGradient returned by the IRange.Interior.Gradient property. |
 | IHPageBreak | Represents a horizontal page break (a row page break) in a worksheet. |
 | IHPageBreaks | Represents the collection of horizontal page breaks (row page breaks) in a worksheet. |
 | IHyperlink | Represents a hyperlink. |
 | IHyperlinks | Represents a hyperlink collection. |
 | IIcon | Represents an individual icon in an icon set. |
 | IIconCriteria | Represents the collection of criteria for a conditional format which uses a set of icons. |
 | IIconCriterion | Represents an individual criterion for a conditional format which uses a set of icons. |
 | IIconSet | Represents an icon set. |
 | IIconSetCondition | Represents a conditional format which uses a set of icons. |
 | IIconSets | Represents a collection of icon sets. |
 | IInterior | Represents the interior of a cell, range or object. |
 | ILinearGradient | Represents a linear gradient returned by the IInterior.Gradient property. |
 | IModule | Represents a module. |
 | IName | Represents a defined name. |
 | INames | Represents the collection of defined names in a workbook or worksheet. |
 | INegativeBarFormat | Represents the negative bar format of a data bar conditional format. |
 | IOutline | Represents the outlining options of a worksheet. |
 | IPageSetup | Represents the page setup properties of a worksheet. |
 | IPane | Represents a worksheet window pane. |
 | IPanes | Represents the collection of window panes associated with a worksheet. |
 | IPrintable | Marks a class or interface as being printable. |
 | IProtection | Represents the fine-grained protection attributes of a worksheet. |
 | IRange | Represents one or more cells, rows, columns, or ranges of cells. |
 | IRectangularGradient | Represents a rectangular gradient returned by the IInterior.Gradient property. |
 | ISheet | The base interface of all sheets in a workbook, including worksheets, chart sheets, dialog sheets, macro sheets and VBA modules. |
 | ISheets | Represents all of the sheets in a workbook, including worksheets, chart sheets, dialog sheets, macro sheets and VBA modules. |
 | IStyle | Represents an individual named cell style associated with a workbook. |
 | IStyles | Represents the named cell styles associated with a workbook. |
 | ITab | Represents a sheet tab. |
 | ITop10 | Represents a conditional format for top or bottom ranking values. |
 | IUniqueValues | Represents a conditional format for duplicate or unique values. |
 | IValidation | Represents the data validation associated with a range of cells. |
 | IVPageBreak | Represents a vertical page break (a column page break) in a worksheet. |
 | IVPageBreaks | Represents the collection of vertical page breaks (column page breaks) in a worksheet. |
 | IWorkbook | Represents a workbook. |
 | IWorkbooks | Represents all of the workbooks in a workbook set. |
 | IWorkbookSet | Manages a set of workbooks which may refer to each other by external cell references or external defined name references. |
 | IWorkbookWindowInfo | Represents workbook specific window information. |
 | IWorkbookWindowInfos | Represents a collection of IWorkbookWindowInfo instances in a workbook. |
 | IWorksheet | Represents a worksheet. |
 | IWorksheets | Represents a collection of worksheets in a workbook. |
 | IWorksheetWindowInfo | Represents worksheet specific window information. |
 | IWorksheetWindowInfos | Represents a collection of IWorksheetWindowInfo instances in a worksheet. |