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Flags of Argentina

Buenos Aires spends its first two and a half centuries as a secondary port under the distant Viceroyalty of Peru, elevated to the seat of its own viceroyalty only in 1776 as Spain reoriented toward Atlantic trade. The 25 May 1810 May Revolution deposed the Spanish viceroy in favor of a local junta, and two years into the independence war, Manuel Belgrano raised a new light-blue-and-white flag over the Rosario batteries in February 1812 — a banner that, with one addition, has flown ever since.

Formal independence was declared at the Congress of Tucumán on 9 July 1816, and José de San Martín's subsequent campaigns carried that same flag across the Andes to liberate Chile (1817–18) and on to Peru (1821). What followed at home was far rockier: decades of civil war between a Buenos Aires-centered Unitarian faction and the Federalists of the interior provinces, not settled into a stable, unified republic until national reorganization in the 1860s.

Scope of this page: the lands of present-day Argentina, c. 1516–present, six political entities. Unlike some other pages in this atlas, this one carries no internal-partition map: Argentina's 19th-century turmoil was a factional and political struggle — Unitarians versus Federalists, Buenos Aires versus the interior provinces — fought under one continuous flag rather than a genuine split into separately crowned or separately flagged entities. The provinces fought each other, but nobody raised a rival banner. Part of a larger atlas — see the linked pages at the bottom.

One border — except for the nine years Buenos Aires Province split away

Argentina's own real border, traced whole for most of its history. Buenos Aires Province seceded from the rest of the Argentine Confederation from 1852 to 1861, and the map below now draws that split as its own traced region for exactly that span, merging back into one border at the 1861 reunification. Press play, or drag the slider, to watch who held it, era to era.

Buenos Aires Province seceded from the Argentine Confederation from 1852 to 1861 — the closest this country comes to a genuine internal partition. That split was real but resolved within a single decade, inside a period this atlas’ own Argentina timeline still treats as one combined "civil war era" entry rather than two separate rival states. The map below now draws Buenos Aires Province as its own traced region for exactly that nine-year span — schematic, since no surveyed 1850s provincial boundary is being reproduced here and no specific documented flag is claimed for the seceding province — before the two regions merge back into one border at the 1861 reunification, matching this page’s own timeline.

c. 1516

Spanish colonial rule from Lima / earlier settlement

Real traced border (modern frontier); the Buenos Aires Province / rest-of-Argentina dividing line is a schematic approximation, not a surveyed 1850s provincial boundary, and appears only for the 1852–61 secession — see the rule box above.

light blue – white – light blue, gold Sol de Mayo — unchanged since 1861 reunification

1861 – present

Argentine Republic (unified, modern)

RepublicBartolomé MitreRoman Catholic (constitutionally supported)

Migration & conquest:Immigration: mass Italian & Spanish wave (1870s–1930s)Immigration: Eastern European Jewish settlersEmigration: economic-crisis exodus (1998–2002)

Who & why: the September 1861 Battle of Pavón breaks the last major Confederation resistance, and Buenos Aires province rejoins the rest of the country under the 1853 federal constitution, finally settling the Unitarian–Federalist civil wars into one stable republic. The flag itself sees no further changes even through a genuinely turbulent 20th century — Peronism from the 1940s, a series of military coups, the brutal 1976–83 dictatorship and its "Dirty War," and the 1982 Falklands/Malvinas War against Britain.

What it represents: the same light-blue-white-light-blue horizontal triband fixed by law in 1816, now carrying the golden Sol de Mayo (Sun of May) that was added to the center stripe in 1818 and made the sole official civil and state flag as the country reunified.

Paint guide

Proportions9:14, three equal horizontal bands.

LayoutLight blue – white – light blue horizontal triband, gold sun with a simple face centered on the white stripe.

Light blue (celeste)#74ACDF

White#F4EFE1

Sol de Mayo, gold#F6B40E

the same law-fixed flag, flown by both sides of a fractured country

1820s – 1861

Civil war era / Argentine Confederation

Confederation, civil conflictJuan Manuel de RosasRoman Catholic (traditional)

Who & why: after 1820 the fragile national government collapses, and the country splinters into loosely confederated provinces racked by recurring war between Unitarians, who wanted a centralized state run from Buenos Aires, and Federalists, who wanted provincial autonomy. Juan Manuel de Rosas, governor of Buenos Aires province, dominates the era's federalist coalition from 1829 to 1852, controlling the confederation's foreign affairs without ever fully unifying it under a written constitution. His fall at Caseros in 1852 opens a decade of further struggle between Buenos Aires and the rest of the Confederation before Pavón finally resolves it in 1861.

What it represents: despite the deep internal conflict, no rival flag emerges — the light-blue-white-light-blue banner with its 1818 sun, already fixed by national law, is flown by Unitarians, Federalists, and everyone in between throughout this fractured period.

Paint guide

ProportionsNo single ratio enforced during this period; shown at 3:2.

LayoutLight blue – white – light blue horizontal triband, gold sun centered on the white stripe.

Light blue (celeste)#74ACDF

White#F4EFE1

Sol de Mayo, gold#F6B40E

the sun is added to the stripe in 1818, two years into this era

1816 – 1820s

United Provinces of the Río de la Plata (independence declared)

Republic, independence declaredJuan Martín de PueyrredónRoman Catholic (established, per 1819 constitution)

Who & why: delegates at the Congress of Tucumán, with San Martín's army already in the field, formally declare independence from Spain on 9 July 1816. The following year San Martín leads his army across the Andes, liberating Chile by 1818, and in 1821 pushes on to liberate Peru — extending the reach of the new flag far beyond the provinces that raised it.

What it represents: Belgrano's light-blue-and-white banner, already the flag of the independence war, is joined on 25 February 1818 by the gold Sol de Mayo on its center stripe, commemorating the May Revolution; the design from this point on is essentially the flag Argentina still flies.

Paint guide

ProportionsNo fixed civil ratio recorded for this period; shown at 3:2.

LayoutLight blue – white – light blue horizontal triband; plain through mid-1816, gold sun added to the center stripe from 25 February 1818.

Light blue (celeste)#74ACDF

White#F4EFE1

Sol de Mayo, gold (from 1818)#F6B40E

Belgrano's original 1812 flag, plain, no sun yet

1810 – 1816

War of independence / United Provinces (revolutionary period)

Revolutionary juntaCornelio SaavedraRoman Catholic (established)

Who & why: the 25 May 1810 May Revolution in Buenos Aires deposes the Spanish viceroy, replacing him with a local junta that governs, at first, nominally in the name of the deposed Spanish king Ferdinand VII while war with royalist forces spreads across the interior. Manuel Belgrano, commanding troops at the Rosario batteries on the Paraná River, raises a new light-blue-and-white flag on 27 February 1812 — a banner meant for the independence war effort rather than any single province.

What it represents: two horizontal light-blue stripes flanking a white one, with no sun or other device yet; the colors are traditionally linked to the sky over Buenos Aires on the day of the revolution, though the exact reasoning is debated. It is adopted informally as the flag of the patriot army well before any government formally sanctions it.

Paint guide

ProportionsNo fixed ratio recorded; shown at 3:2.

LayoutLight blue – white – light blue horizontal triband, no device.

Light blue (celeste)#74ACDF

White#F4EFE1

Cross of Burgundy on white — the Spanish crown's military and naval ensign

1776 – 1810

Viceroyalty of the Río de la Plata (Spanish colonial)

ColonyPedro de CevallosRoman Catholic (Spanish Empire)

Migration & conquest:Immigration: forced deportation via the slave trade

Ruling house:House of Bourbon (Spain)

Who & why: Spain elevates Buenos Aires to the seat of a brand-new viceroyalty in 1776, carving it out of the older Viceroyalty of Peru. The move reflects the growing weight of Atlantic trade — silver, hides, and contraband moving through the Río de la Plata estuary — over the older, more cumbersome Pacific route through Lima and Panama. Buenos Aires grows quickly into the region's real administrative and commercial center, setting up the conditions for the 1810 revolution three and a half decades later.

What it represents: Spain had no single national flag through most of this period; ships and fortresses of the crown flew the red, jagged Cross of Burgundy (Saint Andrew's cross) on white, the standard Spanish military and naval ensign of the era, shown here as representative of royal authority over the new viceroyalty.

Paint guide

ProportionsNo fixed civil ratio; shown at 3:2.

LayoutWhite field, red saltire (Cross of Burgundy) — shown simplified as straight diagonal bars rather than the traditional jagged, knotted-branch outline.

White#F4EFE1

Cross, red#9C3B28

the same Spanish ensign, administered from distant Lima

c. 1516 – 1776

Spanish colonial rule from Lima / earlier settlement

ColonyNo single ruler documentedRoman Catholic (Spanish Empire)

Migration & conquest:Conquered by: Spain (from 1516)

Ruling house:House of Habsburg (Spain)House of Bourbon (Spain)

Who & why: before Spanish contact, the region is home to peoples including the Diaguita in the northwest, the Guaraní along the upper Paraná and Uruguay rivers, and the Mapuche in the south — none of them under any single flag or crown. Spanish exploration reaches the Río de la Plata estuary in 1516 with Juan Díaz de Solís; early Spanish settlement is sparse and slow, with Buenos Aires itself founded and then abandoned in 1536 before a lasting refoundation in 1580. For most of this span the territory is administered, thinly and from very far away, as a minor holding of the Viceroyalty of Peru, seated in Lima.

What it represents: no separate flag exists for this remote and lightly settled corner of the Spanish empire; the same Cross of Burgundy used across Spain's American possessions stands in here, honestly, for the crown's nominal authority rather than for any flag specific to the future Argentina.

Paint guide

ProportionsNo fixed civil ratio; shown at 3:2.

LayoutWhite field, red saltire (Cross of Burgundy), simplified.

White#F4EFE1

Cross, red#9C3B28

Reading the tags

Colony — under Spanish viceregal authority

Revolutionary junta — governing in revolt, independence not yet declared

Republic, independence declared — sovereign, formally declared at Tucumán

Confederation, civil conflict — loosely joined provinces at war with each other

Republic — unified, stable federal republic

Leader — the named ruler most associated with the era's start

State religion — the official/established faith, not the population's

Find the records

Family history research for Argentina lives in a different project, Record Atlas, which maps which archive actually holds the paper for a given place and era.

Search Record Atlas for Argentina →

Records here are filed by historical jurisdiction, not modern borders — check the region that covers your ancestral town:

Santa Fe — Rosario

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