A number of schools in Luton, Dunstable and Houghton Regis were fully or partially closed in the one-day strike by teachers on Tuesday.
Members of the NUT and the NASUWT teacher unions took the action jointly over disputes about pay, pensions, working conditions, jobs and fears for the future of education.
A rally was held on Market Hill, Luton, as part of the protest.
Sarah Anderson, secretary of the Central Beds branch of the NUT, said they sympathised with parents over any disruption caused by the strike.
She said: “We are seeking parents’ support. We have reluctantly had to go ahead with our action because we feel we simply have no alternative and we must defend education for the young people of this country. We need parents to understand what the attacks on the teaching profession actually mean for the future of our schools.”
Video coverage of the rally is at www.lutontoday.co.uk.