The Hold Still digital exhibition, launched in conjunction with the National Portrait Gallery, showcases 100 images taken during the nationwide shutdown.
More than 31,000 entries were received and curated by the duchess and a panel of judges.
As the exhibition went live on Monday, the Queen said: “It was with great pleasure that I had the opportunity to look through a number of the portraits that made the final 100 images for the Hold Still photography project.
“The Duchess of Cambridge and I were inspired to see how the photographs have captured the resilience of the British people at such a challenging time, whether that is through celebrating frontline workers, recognising community spirit or showing the efforts of individuals supporting those in need.
“The Duchess of Cambridge and I send our best wishes and congratulations to all those who submitted a portrait to the project.”
The exhibition focuses on three themes – helpers and heroes, your new normal and acts of kindness – with the final 100 tackling subjects including family life in lockdown, the work of healthcare staff and the Black Lives Matter movement.
The Hold Still initiative aimed to capture and document “the spirit, the mood, the hopes, the fears and the feelings of the nation” as the UK dealt with the coronavirus outbreak.
A selection of the photographs will be shown in towns and cities across the UK later in the year.