South Korea profile
A chronology of key events:
1945 - After World War II, Japanese occupation ends with Soviet troops occupying area north of the 38th parallel, and US troops in the south.
1948 - Republic of Korea proclaimed.
The Korean war (1950-1953) killed at least 2.5 million people. It pitted the North - backed by Chinese forces - against the South, supported militarily by the United Nations
1950 - South declares independence, sparking North Korean invasion.
1953 - Armistice ends Korean War, which has cost two million lives.
1950s - South sustained by crucial US military, economic and political support.
1960 - President Syngman Ree steps down after student protests against electoral fraud. New constitution forms Second Republic, but political freedom remains limited.Coup
1961 - Military coup puts General Park Chung-hee in power.
1963 - General Park restores some political freedom and proclaims Third Republic. Major programme of industrial development begins.
1972 - Martial law. Park increases his powers with constitutional changes.
After secret North-South talks, both sides seek to develop dialogue aimed at unification.
1979 - Park assassinated. General Chun Doo-hwan assumes power.
Hundreds died as troops fired on 1980 rally
1980 - Martial law declared after student demonstrations. In the city of Gwangju (Kwangju) at least 200 killed by the army, causing resentment that has yet to fade. Fifth republic and new constitution.
1981 - Chun indirectly elected to a seven year term. Martial law ends, but government continues to have strong powers to prevent dissent.
1986 - Constitution is changed to allow direct election of the president.Return to democracy
1980s - Increasing shift towards high-tech and computer industry.
1987 - President Chun pushed out of office by student unrest and international pressure in the build-up to the Sixth constitution. Roh Tae-woo succeeds Chun, grants greater degree of political liberalisation and launches anti-corruption drive.
North (l) and South (r) Korean soldiers stand at arm's length
1988 - Olympic games in Seoul. First free parliamentary elections.
1991 - North and South Korea join the United Nations.
1993 - Roh succeeded by Kim Young Sam, a former opponent of the regime and the first civilian president.
1995 - Corruption and treason charges against Roh Tae-woo and Chun Doo-hwan.
1996 - North Korean submarine runs aground in South, 11 crew found shot dead in apparent suicide and 13 killed by South Korean forces during massive search operation.
South Korea admitted to Organisation for Economic Cooperation and Development.
1998 - Kim Dae-jung sworn in as president and pursues "sunshine policy" of offering unconditional economic and humanitarian aid to North Korea.
South Korea captures North Korean mini-submarine in its waters. Nine crew inside found dead.
Kim Dae-jung: Former president won Nobel Peace Prize
2000 June - Summit in Pyongyang between Kim Jong-il and South Korean President Kim Dae-jung. North stops propaganda broadcasts against South.
2000 August - Border liaison offices re-open at truce village of Panmunjom. South Korea gives amnesty to more than 3,500 prisoners. One hundred North Koreans meet their relatives in the South in a highly-charged, emotional reunion. Kim Dae-jung awarded Nobel Peace Prize.
2001 - Opening of Incheon International airport, built on tidal land off port of Incheon.
2002 March - Group of 25 North Koreans defect to South Korea through Spanish embassy in Beijing, highlighting plight of tens of thousands hiding in China after fleeing famine, repression in North.Naval battle
2002 June - Battle between South Korean and North Korean naval vessels along their disputed sea border leaves four South Koreans dead and 19 wounded. Thirty North Koreans are thought to have been killed.
2002 December - Roh Moo-hyun, from governing Millennium Democratic Party, wins closely-fought presidential elections.
2003 October - Biggest mass crossing of demilitarised zone since Korean War: Hundreds of South Koreans travel to Pyongyang for opening of gymnasium funded by South's Hyundai conglomerate.
2004 February - Parliament approves controversial dispatch of 3,000 troops to Iraq.
Labour unrest flares up regularly
2004 March-May - President Roh Moo-hyun suspended after parliament votes to impeach him over breach of election rules and for incompetence. In May the Constitutional Court overturns the move and President Roh is reinstated.
2004 June - US proposes to cut by a third its troop presence. Opposition raises security fears over the plan.
2004 August - Yeongi-Kongju area selected as site for new capital, to replace Seoul by 2030.
2004 September - South Korea admits that its scientists carried out an experiment to enrich uranium in 2000. In November the UN's nuclear watchdog rebukes Seoul but decides not to refer the matter to the Security Council.
Dispute over Dokdo, known as Takeshima in Japan, sours ties
2005 March - Japan restates its claim to a small group of islands whose sovereignty is disputed by Seoul and Tokyo. South Korea says the move seriously damages relations.
2005 June - Kim Woo-choong, the fugitive former head of Daewoo, returns and is arrested for his role in the industrial giant's $70bn-plus collapse. In May 2006 he is sentenced to 10 years in jail.
2005 December - South Koreans are shocked by revelations that cloning scientist and national hero Dr Hwang Woo-suk faked landmark research on stem cell research. He goes on trial in June 2006, charged with misusing funding.South Korean at UN helm
2006 October - Foreign Minister Ban Ki-moon is appointed as the UN's new secretary-general. He takes office in January 2007, becoming the first UN chief to disclose his finances publicly.
2007 February - South and North Korea agree to restart high-level talks suspended since July 2006 in wake of North's nuclear test.
Head of the largest South Korean car maker, Hyundai, is jailed for three years for embezzlement.
South Korea agrees with US to assume operational control of its own military forces, in the event of war, from 2012.
2007 April - South Korea and the US agree on a free-trade deal after 10 months of talks.Thaw gathers pace
Historic train crossing
Trains from North and South crossed the border in 2007
2007 May - Passenger trains cross the North-South border for the first time in 56 years.
2007 October - The leaders of North and South Korea pledge at a summit to seek talks to formally end the Korean war.
2007 November - Prime ministers from North and South Korea meet for the first time in 15 years.
2007 December - Conservative Lee Myung-bak wins landslide victory in presidential election.
2008 February - The country's greatest cultural treasure, the Namdaemun Gate, is destroyed by fire.Thaw stalls
2008 April - North Korea hits out at new South Korean President Lee Myung-bak, warning that his tough stance could lead to "catastrophic consequences".
President Lee's Grand National Party wins a slim majority in parliament.
President Lee ended his predecessor's "sunshine policy" in 2008
2008 July - First shipment of US beef in five years arrives after Seoul negotiates further safeguards in its import deal with Washington, in response to street protests.
North Korean soldier shoots South Korean woman in the North's Mount Kumgang special tourism area, leading to tensions between the two sides.Financial crisis
2008 October - South Korean banks become vulnerable to global credit crisis as result of having taken on high levels of foreign debt. Government announces $130bn financial rescue package to shore up banking system and stabilise markets.
2009 January - North Korea says it is scrapping all military and political deals with the South over its "hostile intent", as ties worsen.
2009 February - South Korea's central bank cuts interest rates to a record low, amid forecasts that the economy is likely to suffer its first annual contraction for more than 10 years.
2009 May - Former president Roh Moo-hyun commits suicide over a bribery scandal.
2009 August - Former South Korean president Kim Dae-jung dies; North Korea sends a senior delegation to Seoul to pay its respects.
In a further sign of thaw in relations, North Korea announces easing of restrictions on cross-border traffic, and talks on family reunions - suspended since early 2008 - restart.
2009 October - North Korea expresses "regret" for unleashing dam water that drowned six campers downstream in South Korea in September. The two sides hold talks aimed at preventing flooding on the Imjin River which spans their militarised border.
2009 November - South and North Korean warships exchange fire across a disputed sea border.
2010 January - North Korea accepts an offer of food aid from South Korea, the first such aid in two years.
South Korea returns fire after the North fires artillery shells near their disputed sea border.Sinking
North Korea denied claims it sank the Southern warship Cheonan in 2010
2010 May - South Korea breaks off all trade with the North after investigators say they have found proof the South Korean naval ship Cheonan was sunk by a North Korean torpedo in March. Pyongyang describes the findings as a "fabrication" and cuts all diplomatic ties with Seoul.
2010 November - Cross-border clash near disputed maritime border results in death of two South Korean marines. North Korea's military insists it did not open fire first and blames the South. South Korea places its military on highest non-wartime alert after shells land on Yeonpyeong island.
2011 July - Nuclear envoys from North and South Korea hold first talks since collapse of six-party talks in 2009.
2011 August - Further exchange of fire near Yeonpyeong island.
2011 October - US Congress approves long-stalled free trade agreement with South Korea. The deal is expected to increase US exports to South Korea.
2012 March - South Korea hosts a global conference on nuclear security, attended by the US and Russian leaders among others. Iran and North Korea do not attend.
2012 April - The governing conservative Saenuri (New Frontier) Party, formerly called the Grand National Party, wins parliamentary elections with a reduced majority.
2012 June - South Korea becomes the first major Asian economy to halt oil imports from Iran.
2012 July - South Korea begins move of most ministries to "mini capital" at Sejong City, 120km south of Seoul. Key ministries will remain in Seoul.
2012 August - Lee Myung-bak becomes South Korea's first president to visit the Liancourt Rocks, which Japan also claims. Tokyo recalls its ambassador in protest.
2012 October - South Korea strikes deal with the US to almost triple the range of its ballistic missile system to 800km as a response to North Korea's test of a long-range rocket in April.
2012 December - South Korea elects its first female president, Park Geun-hye. She takes office in February.New spike in tensions
2013 January - South Korea launches a satellite into orbit for the first time using a rocket launched from its own soil. Previous attempts in 2009-10 failed. The launch comes weeks after a North Korean rocket placed a satellite in orbit.
2013 March - South warns North over unilateral abrogation of Korean War armistice and bellicose rhetoric. North also cut off a hotline and vowed to end non-aggressions pacts with South. A cyber-attack from an internet address in China temporarily shuts down the computer systems at South Korean banks and broadcasters.
2013 April - North Korea says it will restart all facilities at its main Yongbyon nuclear complex and withdraws its workers from the South-Korean-funded Kaesong joint industrial park. It also warns foreigners to leave both North and South Korea to avoid the threat of war.
It later offers talks to reduce tension if UN sanctions are lifted and the US and South Korea end joint military drills. South Korea rejects the proposals as "incomprehensible".
2013 May - North Korea tests four short-range missile over one weekend. It also sentences US tour operator Kenneth Bae to hard labour on charges of "anti-government crimes".
2013 June - North and South Korea agree to hold talks on the possibility of reopening the Kaesong joint industrial complex, as well as to restore the Cross hotline. Both resume in September.
2013 October - South Korea and US sign military pact to provide more co-ordinated response against possible nuclear threats from North.
2013 December - South Korea announces expansion of air defence zone, two weeks after China unilaterally announced its own extended air defence zone in East China Sea to include disputed Socotra Rock.
2014 March - North and South Korea exchange fire into sea across the disputed western maritime border during largest South-US military training exercise in region for 20 years.
North Korea test-fires two medium-range Nodong ballistic missiles for the first time since 2009, in violation of UN resolutions and just hours after the US, South Korea and Japan met in the Netherlands for talks. It also marks the fourth anniversary of the sinking of the South Korean warship Cheonan.
President Park Geun-hye meets Japanese Prime Minister Shinzo Abe at Hague nuclear summit under US auspices, to reduce tension over Japanese government's defensive stance on Second World War record.
2014 April - Sewol ferry sinks off west coast, killing at least 281 people, mainly high-school students. Captain and three other crew members charged with manslaughter.
Visiting President Barack Obama assures South Korea over of US support over concerns North could be preparing nuclear test.
2014 May - Prime Minister Chung Hong-won resigns over criticism of handling of ferry sinking. Successor, former Supreme Court judge Ahn Dai-hee, tasked with solving public sector problems highlighted by Sewol scandal. Spy chief and National Security Council head also resign.