Saldanha Bay Municipality (Afrikaans: Saldanhabaai Munisipaliteit; Xhosa: uMasipala wase Saldanha Bay) is a local municipality located within the West Coast District Municipality, in the Western Cape province of South Africa. As of 2022^[update], it had a population of 154,635. Its municipality code is WC014.

The municipality covers a total area of 2,015 square kilometres (778 sq mi) which includes the West Coast Peninsula (also known as the Vredenburg Peninsula) and stretches southeast to include the West Coast National Park and the area around Hopefield. It abuts on the Bergrivier Municipality to the north and the Swartland Municipality to the east and south.

According to the 2022 South African census, the municipality had a population of 154,635 people, with an average annual growth rate of 4.4% between 2011 and 2022. 51.2% of the population identified as "Coloured," 30.2% as "Black African," and 16.5% as "White."

According to the 2011 census the municipality had a population of 99,193 people in 28,835 households. Of this population, 55.8% describe themselves as "Coloured", 24.5% as "Black African", and 18.0% as "White". The first language of 72.5% of the population is Afrikaans, while 16.4% speak Xhosa, 6.6% speak English and 1.2% speak Sotho.

The seat of the municipality and its largest town is Vredenburg, which is situated in the center of the eponymous peninsula and according to the 2011 census has a population of 38,382. To the south of Vredenburg is the harbour town of Saldanha (pop. 28,142) on the edge of Saldanha Bay. There are several other fishing and holiday towns on the coast of the municipality: St Helena Bay (pop. 11,529) on the northern coast of the Vredenburg Peninsula, Paternoster (pop. 1,971) and Jacobsbaai (pop. 416) on the western coast of the peninsula, and Langebaan (pop. 8,297) on the opposite side of Saldanha Bay from Saldanha. In the interior of the municipality is the town of Hopefield (pop. 6,460) and the village and air force base at Langebaanweg (pop. 952).

The towns of Vredenburg and Saldanha were united under a single Vredenburg-Saldanha Municipality in 1975. At the end of the apartheid era, in the area that is today the Saldanha Bay Municipality there were also municipal councils for Hopefield, Langebaan and St Helena Bay. These councils were elected by the white residents, while the coloured residents of the towns were governed by management committees subordinate to the white councils.

While the negotiations to end apartheid were taking place a process was established for local authorities to negotiate voluntary mergers. Hopefield took part in this process, merging the municipal council with the management committee in November 1992. Langebaan did the same in April 1993.

After the national elections of 1994 a process of local government transformation began, in which negotiations were held between the existing local authorities, political parties, and local community organisations. As a result of these negotiations, the existing local authorities were dissolved and transitional local councils (TLCs) were created in January 1995. The Hopefield and Langebaan municipalities were each replaced with a TLC. The West Coast Peninsula TLC replaced the Vredenburg-Saldanha Municipality, the St Helena Bay Municipality, and their respective management committees.