Okayama Electric Tramway (岡山電気軌道, Okayama Denki Kidō) is a transportation company in Okayama City, Chūgoku, Japan. The private company operates tram lines and bus lines. The company and its lines are officially abbreviated as Okaden (岡電).

The company was founded in 1910, while its first tram line was opened in 1912. This is one of the few Japanese railway operators that maintained their original corporation names from the foundation in Meiji Period. The company is a core member of the Ryōbi Group, another core member being Ryōbi Bus. From October 1, 2006, together with Ryōbi Bus and Okayama bus company Shimotsui Dentetsu (Shimoden), Okaden introduced Hareca, a smart card ticketing system accepted on trams and buses in Okayama. Okaden also accepts the 10 Nationwide IC Cards including PiTaPa, ICOCA, Suica and PASMO.

At just 4.7 km long, Okaden's tram system is the shortest in Japan.

† Excludes 3 stations listed on Higashiyama Line.

‡ Seikibashi Line is officially Yanagawa — Seikibashi only (1.6 km (0.99 mi)), though all services continue on the Higashiyama Line to/from Okayama-Ekimae.

* Excludes temporary stop Kyobashi Iryujo [ja] which is only used on specific days. It is not listed in company maps/timetables/etc.

As of February 2025^[update], trams operate at the following frequencies:

Higashiyama Line has running time of 16-24 minutes, operating between approx. 06:00 and 22:00 every day.