Groups set up throughout the US and elsewhere are organising local campaigns designed to coalesce opposition around issues such as the prevention of oil pipeline construction and the outlawing of female genital mutilation.
Womens March Global, the international arm of the Washington march, said they were determined to capitalise on the wave of activism that had attracted so many people, including first-time campaigners.
The women of the world were sitting on a powder keg and Donald Trump just lit the match, Evvie Harmon, a Womens March co-founder and global coordinator, told the Guardian before the march.
The Washington march is expected to be more orderly than demonstrations in the city on Friday, when more than 200 people were arrested for vandalising shops and cars and clashing with police.
The event kicked off at 10am EST with a rally on the corner of 3rd St and Independence Ave, and was due to end at the Washington Monument at around 4pm. Thousands of people streamed into the capital from around the US, many wearing hand-knit pink pussy hats and wielding signs with messages such as The future is female and Less fear more love.
Rena Wilson, of Charlotte, North Carolina, said she hoped women could send Trump a message that theyre not going anywhere. Joy Rodriguez, of Miami, who arrived with her husband and their two daughters, aged 12 and 10, said: I want to make sure their rights are not infringed on in these years coming up.
While Trump struggled to get A-list names to perform at his inauguration celebrations, the Womens March on Washington attracted singing and acting stars such as Katy Perry, America Ferrera, Uzo Aduba, Scarlett Johansson, Cher and the young actor and singer Zendaya.
Other celebrity guests included model Chrissy Teigen, comedians Amy Schumer and Cristela Alonzo, TV host Padma Lakshmi, artist Kara Walker, and actors Hari Nef, Amandla Stenberg, Frances McDormand and Julianne Moore. The promised performance lineup included Janelle Monae, Maxwell, Samantha Ronson, the Indigo Girls and Mary Chapin Carpenter.
Protesters in Australia and New Zealand were the first to start marching on Saturday. In Sydney, about 3,000 people gathered for a rally in Hyde Park before marching on the US consulate. A further 5,000 people rallied in Melbourne, and 2,000 people gathered across four cities in New Zealand.
In Europe, marches took place in cities including Berlin, Paris, Rome, Vienna, Geneva and Amsterdam. In Africa, hundreds of protesters in Nairobis Karura forest waved placards and sang American protest songs, and in Iraq a march organiser said women were daring to stand up to challenges including lack of salaries, terror, hate, exploitation, and trafficking.
According to a recent poll, Trump had the lowest favourability rating of any incoming president since the 1970s. His attitudes toward women dominated his presidential campaign, particularly after a video revealed him saying he could do anything to women, including kiss them without permission and grab them by the pussy.
At least 24 women came forward with allegations of inappropriate sexual behaviour by the businessman and former reality TV star, spanning a period of more than 30 years allegations he has consistently denied.