The COVID-19 pandemic reached Northern Ireland in February 2020. Northern Ireland has the lowest COVID death rate per population in the United Kingdom."Covid-19: NI in much better place one year on" . BBC News, 28 February 2021. Covid statistics were very available at the start of the pandemic. The vast majority of deaths were among those over the age of 60 and almost half were in care homes.

On 23 March 2020, Northern Ireland went into lockdown with the rest of the UK. A stay-at-home order banned "non-essential" travel and contact with others, and schools, businesses, venues, amenities and places of worship were shut. Major events such as Saint Patrick's Day were cancelled. A lengthy lockdown was forecast to severely damage the economy and lead to a large rise in unemployment. The health service worked to raise hospital capacity. In mid-April, Department of Health modeling indicated the health service in Northern Ireland could cope with the expected peak in cases. On 21 April, Northern Ireland's chief scientific advisor said the curve of new cases had flattened, and the peak had passed."Coronavirus: NI outlook positive as curve 'flattens'" . BBC News, 21 April 2020. Quotes: "The curve for cases of Covid-19 in Northern Ireland is flattening and we could soon be on the downward slope, Northern Ireland's chief scientific advisor has said … Recent reductions in the daily number of hospital admissions as well as the number of deaths suggest that Northern Ireland passed the peak of its outbreak several days ago."

The lockdown was gradually lifted in June–July, as infection and death rates dropped. Schools remained closed for summer break, but re-opened in September. The infection rate (or positivity rate) rose again that month and restrictions were re-imposed."Coronavirus restrictions are extended across NI" . BBC News, 21 September 2020. Quotes: "Covid-19 restrictions are to be extended to all of Northern Ireland from 18:00 BST on Tuesday, the Stormont Executive has announced. There will be no mixing of households indoors with some exceptions, and no more than six people from two households can meet in a garden." On 16 October, Northern Ireland went into an eight-week lockdown, although schools remained open, and some restrictions were eased for one week. The lockdown was mostly lifted on 11 December. Following a brief easing of restrictions at Christmas, another lockdown was imposed on 26 December, including schools, as the positivity rate rose sharply. A mass vaccination program began, and the infection rate fell in early 2021. Schools re-opened in March, and the lockdown was gradually lifted from late April. In December, proof of vaccination or non-infection became mandatory to enter indoor venues. The Northern Ireland Statistics and Research Agency reported 5,325 where the death certificate mentioned COVID as one possible cause (see Statistics), as of June 2023.

Timeline Health care in the United Kingdom is devolved, with England, Northern Ireland, Scotland and Wales each having their own publicly funded healthcare systems, funded by devolved block grants via the Barnett formula and accountable to separate governments and parliaments, together with smaller private sector and voluntary provision. As a result of each country having different policies and priorities, differences now exist between these systems.

First wave and national lockdown (March–May 2020) The HSC began testing for COVID-19 during February 2020, as of 19 February there were 35 completed tests all of which returned negative results. On 27 February, the HSC confirmed that the first presumptive case had been discovered in Northern Ireland in a woman who had returned from Italy, the case was sent to the Public Health England reference laboratory where it was confirmed as Northern Ireland's first case on 29 February. Cases continued to rise throughout early March with cases rising to seven by the end of the first week.

On 9 March Belfast City Council voted to cancel the annual St Patrick's Day parade in the city. By the end of the second week the HSC started to advise people showing symptoms to isolate for seven days, cases had also jumped to 45 by 15 March. On St Patrick's Day, parades across all of Northern Ireland had been cancelled as cases reached 52.

On 19 March, Northern Ireland recorded its first death from COVID-19, with cases reaching 77. Reacting to the news, First Minister Arlene Foster said "This is a sad day for Northern Ireland. Our thoughts and prayers are first and foremost with the family and friends of the patient who has died. And we are immeasurably grateful to our health service staff who cared for this person. This is not unexpected news. We knew that this pandemic would inevitably cost precious lives. We cannot stop it. But it is incumbent on all of us to do whatever we can to slow its spread and shield those most vulnerable from the effects of this virus." On 22 March, a second person died from COVID-19, with cases rising to 128.

On 20 March, the UK Government announced measures to further tackle the spread of the virus which included closing bars, restaurants, gyms and many other social venues.

Also on 20 March the UK Government announced a Coronavirus Job Retention Scheme, where it would offer grants to companies to pay 80% of a staff wage each month up to a total of £2,500 per a person, if companies kept staff on their payroll. The scheme would cover three months' wages and would be backdated to the start of March. Later in March the Self Employed Income Support Scheme (SEISS) was announced. The scheme paid a grant worth 80% of self employed profits up to £2,500 each month, on companies whose trading profit was less than £50,000 in the 2018–19 financial year or an average less than £50,000 over the last three financial tax years for those who suffered a loss of income.

Cases confirmed by 20 March were 86 in total.

On 21 March, Northern Ireland suffered its largest increase in new cases to date with 22 new cases confirmed. On 22 March, a second person died from the virus.

A third person died from COVID-19 on 23 March, followed by two more deaths on 24 March. On 25 March, the largest increase in new cases to date was recorded as cases rose by 37 to 209, with 2 new deaths also being confirmed. Speaking at a press conference on 25 March, Northern Ireland's Chief Medical Officer Dr Michael McBride said he believes the actual figure of cases to be "many thousands" and testing would increase to approximately 1000 new tests every day.

On 26 March, a further 3 people died from the virus with 32 new confirmed cases. On 27 March, 34 new cases and 3 new deaths were confirmed, with leading GPs in Northern Ireland writing an open letter calling for a complete lockdown, stating "Please hear and act on our heartfelt plea and move to adopt a 'complete lockdown' as we have seen in other countries, at the earliest opportunity. Time is of the essence.". On 28 March, Northern Ireland experienced the highest rate of increased new cases yet with 49 new cases, and a further 2 deaths.

On the evening of 28 March the Northern Ireland Executive announced new stricter measures to combat the spread of the virus. Measures included: The ability to force businesses to shut and crack down on people who leave their homes without a "reasonable excuse". Penalties, ranging from fixed penalty notices to fines of up to £5,000, are being introduced as enforcement. Anyone who can work remotely must do so Employers must facilitate remote work where it is feasible No employer should compel an employee to come to work if it is feasible to work remotely Every employer must take all reasonable steps to safeguard the health, safety and wellbeing of employees during the COVID-19 emergency, whether working remotely or in the workplace Every employer must have particular regard to the safety of employees in the workplace and must put into effect the guidance on social distancing issued by the department for the Economy Every employer has a legal duty to ensure, so far as it is reasonably practicable, the health, safety and welfare at work of all employees Where a business is failing to observe the department for the Economy guidance and breaching the legal duty on health and safety, the statutory authorities will take robust action, which may include prosecution for criminal offences Where necessary, the Executive Office will also use its power of direction to close or restrict businesses that do not ensure the safety of their employees.

Commenting on the new measures, Arlene Foster said "We are asking the people of Northern Ireland to make fundamental changes to how they live their lives. But we are doing this to keep you safe, to flatten the curve of the Covid-19 infection so that the health service has the capacity to deal with those who need their help the most." Deputy First Minister Michelle O'Neill also commented "Each one of us has a personal responsibility to do everything we can to fight back against Covid-19 for the good of everyone across society. We will use every power we have to ensure people stay at home so that we save as many lives as we possibly can." Text was copied from this source, which is available under an Open Government Licence v3.0 . © Crown copyright.

On 29 March, new cases announced by the Public Health Agency were 86 and 6 new deaths, the highest for both in a single day to date.

Following the announcement on 31 March that there were 53 new cases and 6 new deaths, the totals at the end of the month of March were 586 confirmed cases and 28 deaths.

On 1 April, a further 103 cases and 2 deaths were confirmed as Health Minister Robin Swann warned that 3000 people could die in the first wave of the pandemic. On 2 April, 85 more cases and 6 more deaths were reported, bringing the total number of confirmed cases and deaths to 774 and 36 respectively. On 3 April, the largest increase in deaths and cases to date was published by the Public Health Agency with 130 cases and 12 deaths, bringing the total number of confirmed cases to 904 and the number of deaths to 48.

On 4 April, a further 94 new cases and 8 new deaths were announced, as Northern Ireland's first COVID-19 testing centre for healthcare workers opened at the SSE Arena, Belfast. Health Minister Robin Swann said the new testing facility in Belfast "will allay some of the concern and speculation we have had of late. I fully understand the frustration that we have not been able to scale up testing numbers more quickly. This is not down to a lack of will or action. There are significant challenges including laboratory and staffing capacity and the unprecedented levels of global demand for testing reagents and swabs."

It was reported that more than 33,000 people so far had claimed unemployment benefits since the lockdown began, ten times the normal rate. Economists forecast that a lengthy lockdown and disruption would lead to hundreds of thousands of job losses."Coronavirus: Economic shock to NI becoming clear" . BBC News, 4 April 2020.

On 5 April, an additional 91 cases and 7 deaths were reported, bringing the total number of cases and deaths to 1,089 and 63 respectively.

On 6 April, the Orange Order announced that the annual 12th July celebrations were cancelled, as a further 69 cases and 7 deaths were confirmed. A further 97 cases and 3 deaths were announced by the Public Health Agency on 7 April, as a second drive-through testing centre opened at a MOT centre in Belfast. With Easter weekend approaching, on 8 April, the Police Service of Northern Ireland warned people against visiting local beauty spots, as the death toll increased to 78 with 5 more deaths and 84 new cases being reported.