Dentsū Shiki Theatre Umi, Entertainment venue in Higashi-Shinbashi, Japan

The Dentsū Shiki Theatre Umi is a theatre inside the Dentsu headquarters building in the Caretta Shiodome complex. Its light grey stone facade has a curved glass barrel-vault above a wide glass wall, with a dark sign reading "caretta" in yellow script. The auditorium seats 1,216, and the front of the second balcony extends over the central first-floor seats.

The theater opened in 2002 with a production of Mamma Mia and was established as part of a modern office complex in central Tokyo. Since its founding, it has grown into a central venue for theatrical productions in the city.

The name Umi ("sea") was chosen by then-Dentsu president Yutaka Narita, a former Naval Academy student with a strong attachment to the sea. The theatre opened with Mamma Mia! and has run long Shiki productions such as The Phantom of the Opera, Wicked and Aladdin, the latter since May 2015 under the name Daitō Life Musical Theatre.

Visitors can reach this venue easily from several train stations, with a short walk from Shiodome Station on the Toei Oedo Line being one of the closest options. The central location makes getting there straightforward from different parts of Tokyo.

The name Umi ("sea") was chosen by then-Dentsu president Yutaka Narita, a former naval academy student with a strong attachment to the sea. The theatre opened on 1 December 2002 with Mamma Mia! and has hosted long runs including The Phantom of the Opera, Wicked and Aladdin, running since May 2015.