While three branches were closed by protesters blocking entrances in Manchester.
Demonstrations were also held in Leeds, Sheffield, Brighton, Edinburgh, Bradford, Birmingham and more than 10 other towns and cities across the UK.
Around 1.8 million people have signed a petition calling on Barclays to divest its £1.92million holding in Elbit Systems.
Barclays also holds 4.2 per cent of shares in BAE Systems which has provided F16 fighter jet components and other arms to Israel.
Gaza based activist Abdulrahman Abunahel said: “As Palestinians we suffer immeasurably from attacks by drones supplied by Elbit Systems ? and other weapons supplied to Israel?. Barclays and other companies linked to the arms trade with Israel are profiting directly from Israel’s massacres.
"We call on governments around the world to do the very least they can to stop Israel from carrying out more massacres of our people by imposing a military embargo on Israel. Such steps would be in line with growing public support for our struggle and for the boycott, divestment and sanctions (BDS) campaign.”