Fastjet Airlines Limited (Tanzania), also known as Fastjet Tanzania, is a low-cost airline that operates flights under the fastjet brand in Tanzania. The airline was founded in 2011 as Fly540 Tanzania, but through the acquisition of Fly540 in 2012, it was rebranded as Fastjet Tanzania. It is based in Dar es Salaam. The airline carried more than 350,000 passengers in the first year of operations and sold one million seats by December 2014.

Fastjet Tanzania was founded in 2011 as Fly540 Tanzania, a subsidiary of Kenya-based Fly540. Using a Bombardier CRJ100 and a Dash 8-100, it flew to eight destinations in Tanzania and two in Kenya.

In June 2012, Fly540 was acquired by Rubicon Diversified Investments, which intended to merge all of Fly540's operations into its new venture Fastjet. Fly540 Tanzania suspended operations on 13 October 2012 before being rebranded as Fastjet Tanzania.

Fastjet Tanzania started operations as Fastjet's first operating base in Africa, with flights from Julius Nyerere International Airport commencing on 29 November 2012. Initial flights operated successfully between Dar es Salaam and Kilimanjaro, and between Dar es Salaam and Mwanza.

Further routes were to be added quickly, both domestically and to other East African destinations. It currently (August 2015) has domestic routes operating linking Dar es Salaam with Mwanza, Kilimanjaro and Mbeya, and four international routes from Dar es Salaam to Johannesburg, Harare, Entebbe, Lilongwe and Lusaka.

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