- l -
- Label
: MdiSubWindow
, Table
- latexArrowSymbols
: SymbolDialog
- latexMathSymbols
: SymbolDialog
- LayerTitle
: TextDialog
- LayerTreeItem
: LayerItem
- Left
: Graph
, MultiLayer
, StatisticTest
- LeftLimit
: RangeLimitBox
- Legend
: TextFormatButtons
- LF
: ApplicationWindow
- Line
: FrameWidget
, Graph
- Linear
: Graph
, ScaleTransformation
, Interpolation
- LineSymbols
: Graph
- Ln
: Graph
, ScaleTransformation
- Local
: ApplicationWindow
- LocalExcelInstallation
: ApplicationWindow
- LocalOpenOffice
: ApplicationWindow
- Log10
: ScaleTransformation
, Graph
- Log2
: Graph
, ScaleTransformation
- Logit
: ScaleTransformation
, Graph
- LongName
: ScaleDraw
- Lorentz
: MultiPeakFit
- lowerGreek
: SymbolDialog
- Lowess
: SmoothFilter
- LowPass
: FFTFilter