Lacaille,
Nicolas Louis de Lalande,
Joseph Jérome le François de Langley,
Samuel Pierpoint Lassell,
William Leverrier,
Urbain Jean Joseph Leavitt,
Henrietta Leonardo
da Vinci..Levy,
David Lindblad,
Bertil Lockyer,
Joseph Norman Lovell,
Bernard Lowell,
Percival Lynden-Bell,
Donald Lyttleton,
Raymond Arthur