The province of Grosseto (Italian: provincia di Grosseto) is a province in the Tuscany region of Italy. Its capital is the city of Grosseto. As of 2013 the province had a total population of 225,098 people.

The Province of Grosseto completely occupies the southern end of Tuscany, and with a territorial area of 4,504 square kilometres (1,739 sq mi), it is the most extensive in the region and one of the least dense in population in Italy. The province is bordered to the northwest by the Province of Livorno, to the north by the Province of Pisa, to the northeast by the Province of Siena, and to the southeast by the Province of Viterbo in Lazio. To the south is the Tyrrhenian Sea, which includes the southern islands of the Tuscan archipelago, including Isola del Giglio and the smaller Giannutri islands and Formiche di Grosseto and Formica di Burano. The Arcipelago Toscano National Park spans both the provinces of Grosseto and Livorno, and includes the seven main islands of the Tuscan Archipelago: Elba, Isola del Giglio, Capraia, Montecristo, Pianosa, Giannutri, Gorgona, and some of the minor islands and rock outcrops. The highest point in the park is Mount Capanne, at 1,019 metres (3,343 ft) in elevation, on the island of Elba.

The Colline Metallifere (Metalliferous Hills) line the border in the south with Lazio, and contain the Natural Park of Maremma, that protects also some of the remainings of the large swamps that once covered the area. Other protected areas are the Diaccia Botrona marshland. The principal rivers are the Ombrone, Fiora, Albegna, Pecora, Bruna, Merse, Lente [it], Farma and Chiarone. The coastline between the Gulf of Follonica and the mouth of the Chiarone is dominated by blue waters and pine forests, and is home to resorts such as Marina di Grosseto, Principina a Mare, Castiglione della Pescaia, Punta Ala, Puntone di Scarlino and Talamone. Lakes include Lago dell'Accesa, Lago di Burano, Lago di San Floriano and Lago Acquato. Also of note is the volcanic cone of Mount Amiata, Bandite di Scarlino (213 m), Promontorio di Punta Ala e delle Rocchette (350 m), Monti dell'Uccellina (417 m), Monte Argentario (635 m), and Promontorio di Ansedonia (113 m).

There are 28 comuni (singular: comune) in the province. As of June 2014, the main comuni by population are:

Commune	Population
Grosseto	82,284
Follonica	21,770
Orbetello	14,911
Monte Argentario	12,866
Roccastrada	9,274
Gavorrano	8,727
Massa Marittima	8,600
Manciano	7,386
Castiglione della Pescaia	7,382

This is the complete list of comuni in the province of Grosseto:

This is the complete list of the frazioni (singular: frazione) – towns and villages – in the province of Grosseto:

	President	Term start	Term end	Party
1	Emilio Suardi	8 July 1951	27 September 1952	Italian Communist Party
2	Mario Ferri	27 September 1952	1967	Italian Socialist Party
3	Antonio Palandri	1967	1970	Italian Communist Party
4	Luciano Giorgi	1970	1980	Italian Socialist Party
5	Claudio Asta	1980	1983	Italian Socialist Party
6	Fosco Monaci	1983	1985	Italian Socialist Party
7	Alberto Cerreti	7 September 1985	14 July 1990	Italian Socialist Party
8	Lamberto Ciani	20 July 1990	24 April 1995	Italian Socialist Party
9	Stefano Gentili	8 May 1995	14 June 1999	Democratic Party of the Left
10	Lio Scheggi	16 June 1999	14 June 2004	Democrats of the Left Democratic Party
		14 June 2004	23 June 2009
11	Leonardo Marras	23 June 2009	14 October 2014	Democratic Party
12	Emilio Bonifazi	14 October 2014	19 July 2016	Democratic Party
13	Antonfrancesco Vivarelli Colonna	9 January 2017	19 December 2021	Centre-right independent
14	Francesco Limatola	19 December 2021	Incumbent	Centre-left independent

Media related to Province of Grosseto at Wikimedia Commons

• Official website (in Italian)

42°45′00″N 11°06′30″E / 42.75000°N 11.10833°E / 42.75000; 11.10833