Ballot papers for strikes went out to 7,000 Unison union members in Kirklees Council last week.
The ballot was sparked by the Labour-run council making two Unison members redundant at Ashbrow school in Huddersfield.
These are the first compulsory redundancies imposed by the council. The Unison branch is invoking its longstanding policy of opposing compulsory redundancies.
Union members are holding meetings across the council to campaign for a yes vote. Action is due to start the week starting 23 July