Anas Sarwar, the leader of Scottish Labour, said there should be an "immediate cessation of violence" with conditions attached, hours after Sadiq Khan, the mayor of London, said a ceasefire was vital to avoid a "substantial military escalation".
The interventions are not believed to have been coordinated, but paved the way for more prominent Labour politicians to openly support the move for a deescalation in Gaza.
Starmer has resisted calls from many MPs to support a ceasefire.
Sarwar backed the move with conditions, including an end to rocket exchanges and the release of all hostages taken by Hamas on 7 October.
"We need a proper peace process, because sadly right now there is no peace and there is no process. That's the only way we can see a safe, secure and free Palestine, and a safe, secure and free Israel," Sarwar said in a video on X, formerly known as Twitter.
He said withholding food, water and medicine was a breach of international law.
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