University staff in Oxford from all three education unions have now all voted to go on strike.
On Monday, members of union Unite voted 64 per cent in favour of strike action.
Members of the University and College Union and Unison at Oxford University and Oxford Brookes University have already voted in favour of a strike.
The ballot opened last month following a pay dispute.
No dates for strikes or other details have so far been revealed.
Any strike would affect staff at both universities.
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