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• ObstacleType : QgsPalLayerSettings
• OffsetType : QgsPalLayerSettings
• OneArgOperator : QgsRasterMatrix
• OperationResult : QgsGeometry
• Operator : QgsRasterCalcNode
• OptionType : QgsVectorFileWriter
• Ordering : QgsSourceSelectProvider
• Orientation : QgsColorRampWidget , QgsLayoutItemPage , QgsTextDiagram
• Origin : QgsMapLayerDependency
• OutputValues : QgsKernelDensityEstimation
• OverwriteBehavior : QgsNewGeoPackageLayerDialog