Mswati II (c. 1820–1868), also known as Mswati and Mavuso II, is the king of Eswatini between 1840 and 1868.

He is also the eponym of Eswatini.

Mswati is considered to be one of the greatest fighting kings of Eswatini.

Under his kingship, the territorial boundaries of Eswatini are greatly increased.

Mswati is the son of Sobhuza I and Tsandzile Ndwandwe (known as 'LaZidze) who after ruling as Queen Mother becomes Queen Regent after the death of her son.

After the death of Sobhuza, Mswati inherits an area that extends as far as present day Barberton in the north and includes the Nomahasha district in the Portuguese territory of Mozambique.

Mswati’s military power, initially suppressed by infighting with his brothers Fokoti, Somcuba and Malambule, increases in the late 1850s and thereafter.

When Mswati's armies attack organized forces of other Bantu tribes or nations, the goal is initially plunder in the form of cattle and captives, rather than incorporation into one political unit.

During this period the arrival of Trekboers, in what will become the Transvaal republic, marks the first contact between Swazis and European settlers.

Mswati greatly extends the boundaries of the Swazi territory beyond that of the present state with military outposts and royal villages outposts such as Mbhuleni, on the upper Komati River at the foot of the Mkongomo Mountains, south of Badplaas, Mekemeke which is east of the Mbayiyane Mountains, situated east of Mantibovu (Low’s Creek).

The death of Mswati II in July 1868 enda the era of Swazi conquest, territorial expansion and results in the unification of various people into one nation.