Boyuk Zira lighthouse, Maritime lighthouse on Boyuk Zira Island, Absheron District, Azerbaijan.

Boyuk Zira Lighthouse stands in the north of Boyuk Zira Island in the Caspian Sea, Azerbaijan. It has guided ships entering Baku Bay since 1884, using a kerosene-wick burner and later a gas lantern with a fourth-degree light-optic apparatus. The lighthouse was destroyed at the start of the Great Patriotic War and rebuilt in 1958.

The original installation was built in 1884 and served for many years as a navigation station for ships heading into Baku Bay. Its role changed as other structures later took on similar functions.

The island itself is called Nargin in the sources, and the lighthouse is known as the Nargin lighthouse; the Azerbaijani name Böyük Zirə mayakı is used locally. Until 1907 the Maiden Tower in Baku served as the guiding light for ships, after which the island took over that role. The lighthouse remains an active aid to navigation, marking the entrance to Baku Bay.

The lighthouse stands on Boyuk Zira Island, which is separated from Baku Bay by open water; the sources describe no bridge or regular public access, so the structure is seen from the water rather than visited. It is an active navigational aid, so keep a distance and do not obstruct the light. The island also held antiaircraft guns during the war.

In 1912, this installation became the first in the Russian Empire to adopt acetylene lighting for maritime use. This technology was advanced for its time and made navigation safer than before.