P.O. Box 9513
NL-2300 RA Leiden
The Netherlands

Visiting and courier address:

Huygens Laboratory / J.H. Oort Building
Niels Bohrweg 2
NL-2333 CA Leiden
The Netherlands  

Travel directions:

Leiden Observatory research institute is located at the Bio Science Park in the Oort and Huygens buildings, which are connected by a glass corridor.