| IAudioAdapter | Virtual audio adapter of the virtual machine |
| IBIOSSettings | BIOS settings of the virtual machine |
| IConsole | Interface to control virtual machine execution |
| IConsoleCallback | |
| ICustomHardDisk | Specific type of IHardDisk that is supported through a third-party plugin |
| IDisplay | Virtual machine's display |
| IDVDDrive | Virtual CD/DVD drive of the virtual machine |
| IDVDImage | File containing the image of the DVD or CD disk |
| IDVDImageCollection | |
| IDVDImageEnumerator | |
| IFloppyDrive | Virtual floppy drive of the virtual machine |
| IFloppyImage | File containing the image of a floppy disk |
| IFloppyImageCollection | |
| IFloppyImageEnumerator | |
| IFramebuffer | |
| IFramebufferOverlay | Alpha blended overlay for displaying status icons above an IFramebuffer |
| IGuest | Information about the operating system running inside the virtual machine |
| IGuestOSType | |
| IGuestOSTypeCollection | |
| IGuestOSTypeEnumerator | |
| IHardDisk | Virtual hard disk drive used by virtual machines |
| IHardDiskAttachment | |
| IHardDiskAttachmentCollection | |
| IHardDiskAttachmentEnumerator | |
| IHardDiskCollection | |
| IHardDiskEnumerator | |
| IHost | Physical machine that this VirtualBox installation runs on |
| IHostDVDDrive | Physical CD/DVD drive hardware on the host |
| IHostDVDDriveCollection | |
| IHostDVDDriveEnumerator | |
| IHostFloppyDrive | Physical floppy drive hardware on the host |
| IHostFloppyDriveCollection | |
| IHostFloppyDriveEnumerator | |
| IHostNetworkInterface | |
| IHostNetworkInterfaceCollection | |
| IHostNetworkInterfaceEnumerator | |
| IHostUSBDevice | Physical USB device attached to the host computer |
| IHostUSBDeviceCollection | |
| IHostUSBDeviceEnumerator | |
| IHostUSBDeviceFilter | Global filter for a physical USB device used by the host computer |
| IHostUSBDeviceFilterCollection | |
| IHostUSBDeviceFilterEnumerator | |
| IInternalMachineControl | |
| IInternalSessionControl | |
| IISCSIHardDisk | THe IISCSIHardDisk interface represents a specific type of IHardDisk that uses iSCSI |
| IKeyboard | Virtual machine's keyboard |
| IMachine | Virtual machine, or guest, created in VirtualBox |
| IMachineCollection | |
| IMachineDebugger | |
| IMachineEnumerator | |
| IManagedObjectRef | Managed object reference |
| IMouse | Virtual machine's mouse |
| INetworkAdapter | |
| IParallelPort | Virtual parallel port device |
| IPerformanceCollector | Service that collects and stores performance metrics data |
| IPerformanceMetric | Parameters of the given performance metric |
| IProgress | Task progress object that allows to wait for the completion of some asynchronous task |
| IProgressCollection | |
| IProgressEnumerator | |
| IRemoteDisplayInfo | Contains information about the remote display (VRDP) capabilities and status |
| ISATAController | |
| ISerialPort | Virtual serial port device |
| ISession | Serialization primitive for virtual machines |
| ISharedFolder | Folder in the host computer's file system accessible from the guest OS running inside a virtual machine using an associated logical name |
| ISharedFolderCollection | |
| ISharedFolderEnumerator | |
| ISnapshot | Snapshot of the virtual machine |
| ISnapshotCollection | |
| ISnapshotEnumerator | |
| ISystemProperties | Global properties of the given VirtualBox installation |
| IUSBController | |
| IUSBDevice | Virtual USB device attached to the virtual machine |
| IUSBDeviceCollection | |
| IUSBDeviceEnumerator | |
| IUSBDeviceFilter | USB device filter used to perform actions on a group of USB devices |
| IUSBDeviceFilterCollection | |
| IUSBDeviceFilterEnumerator | |
| IVHDImage | virtual hard disks that use Virtual PC Virtual Machine Disk image files to store hard disk data |
| IVirtualBox | Main interface exposed by the product that provides virtual machine management |
| IVirtualBoxCallback | |
| IVirtualBoxErrorInfo | Extended error information |
| IVirtualDiskImage | Represent a specific type of IHardDisk that uses VDI image files |
| IVMDKImage | Specific type of IHardDisk that uses VMDK image files |
| IVRDPServer | |
| IWebsessionManager | Websession manager |
1.5.5