Protesters will be outside the central library this Saturday afternoon from 11.30am to 1.30pm.
Leader Doreen Steinberg has been campaigning against the library closures since January.
She said: “These closures discriminate against the disabled, the elderly and infirm, the unemployed, children and the residents of these two large areas at either end of Luton. They will have no internet access for job searches, homework, knowledge or even checking the council’s website.
“They get money for libraries but no one know where it goes, we have a right to know.”