The XIX International Conference on Laser Spectroscopy, one of the leading conferences in the very diverse and still growing field of laser spectroscopy, was held in Hokkaido, Japan, on June 7–12, 2009. This volume, comprising a collection of invited contributions presented at the conference, will report on the latest developments in the area of laser spectroscopy and related fields: cold atoms and molecules, degenerate quantum gases, quantum optics, quantum information processing, precision measurements, atomic clock, ultra-fast lasers and strong field phenomena, and novel spectroscopic applications.Contents:Quantum Degenerate GasesAtom ManipulationPrecision MeasurementsOptical Frequency StandardsQuantum Optics and Quantum InformationFrequency CombOptical Lattice and Degenerate Fermi GasesCold MoleculesHot TopicsNovel ApplicationsReadership: Researchers and graduate students in the fields of laser spectroscopy, atomic and molecular physics, atomic optics, quantum gases and quantum information.