Marathon Oil Tower, Office skyscraper in Uptown Houston, United States

Marathon Oil Tower is a 41-floor, 562-foot (171 m) office skyscraper in Uptown Houston. A narrow, dark reddish-brown slab tower with a flat top rises from a wider, lighter brown base; its facade is covered in a dense grid of recessed rectangular windows, and the base has horizontal bands of openings on the left and a larger open section on the right. It stands behind trees.

Marathon Oil Tower was completed in 1983, the work of the architectural firm Pierce Goodwin Alexander & Linville. Construction took only 22 months. The tower was built for Marathon Oil, which kept its headquarters there for over thirty years until relocating in 2021, after which the building was rebranded 5555 San Felipe.

The tower's name comes from Marathon Oil, which had its headquarters here for over thirty years until 2021. After the company left, the building was rebranded as 5555 San Felipe, its street address. Aon Corporation also keeps Houston offices in the tower.

The building is located at 5555 San Felipe Street with convenient access to major highways and public transportation in Houston. The location in Uptown makes it easy to reach nearby restaurants, shops, and other city services.

The building served as Marathon Oil's headquarters for more than 30 years before the company relocated, leading to a rebranding in 2021. This long association with the oil company was a defining part of the tower's identity for decades.