Here are ten of the pictures from the march today:
Protesters from across the country stopped in front of Asda House, the company's national headquarters, to shout 'shame on you' and 'no ifs, not buts, no Asda cuts'.
The GMB union, who organised the march, say staff have been told they will be sacked if they do not sign up to the new terms.
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Asda is offering staff a higher wage in exchange for a new deal - called contract 6 - which will introduce unpaid breaks and a requirement to work over bank holidays.
The GMB are particularly concerned about the impact on single mums, workers who have multiple jobs and people with caring responsibilities, as they will have to be more flexible with their hours at shorter notice.
Ben Kirkham , a GMB organiser for stores in Killingbeck, Pudsey and Morley, told the Yorkshire Evening Post: "People are angry and upset at the way they are being treated by Asda.
The protesters shouted outside Asda House.
The march started at noon in City Square, where marchers were addressed by Leeds East MP Richard Burgon and GMB General Secretary Tim Roache.
An Asda spokesman said: "The retail sector is undergoing significant change and it is important that we are able to keep pace with these changes."
The protesters marched through the car park.
The protesters carried placards through the centre.