Formation processes of high-mass stars have been long-standing issues in astronomy and astrophysics. This is mainly because of major diculties in observational studies such as a smaller number of high-mass young stellar objects (YSOs), larger distances, and more complex structures in young high-mass clusters compared with nearby low-mass isolated star-forming regions (SFRs), and extremely large opacity of in- terstellar dust except for centimeter to submillimeter wavelengths. High resolution and high sensitivity observations with Atacama Large Millimeter/Submillimeter Array (ALMA) at millimeter/submillimeter wavelengths will overcome these observational diculties even for statistical studies with increasing num- ber of high-mass YSO samples. This review will summarize recent progresses in high-mass star-formation studies with ALMA such as clumps and laments in giant molecular cloud complexes and infrared dark clouds (IRDCs), protostellar disks and out ows in dense cores, chemistry, masers, and accretion bursts in high-mass SFRs.

ABSTRACT
1. INTRODUCTION
2. SUMMARY OF ALMA OUTCOMES
3. BASIC CONCEPTS OF HIGH-MASS STAR-FORMATION
4. FILAMENTS, CLUMPS, AND CORES
5. DISKS AND OUTFLOWS
6. CHEMISTRY
7. MASERS AND ACCRETION BURSTS
8. FUTURE PROSPECTS
9. SUMMARY
REFERENCES

• Tomoya Hirota(National Astronomical Observatory of Japan/Department of Astronomical Sciences, SOKENDAI)