Hundreds from the Muslim minority are thought to have died and tens of thousands have fled to Bangladesh since the army launched "clearance operations" four months ago to find the attackers.
Sittwe police chief Yan Naing Lett said the court in the town, the capital of Rakhine, had sentenced the leader of the raid on the Kotankauk border post to death on Friday.
"He was sentenced to death on 10 February at Sittwe court for intentional murder," Yan Naing Lett told AFP, without giving a date for the execution.
The other 13 people also appeared in court but have yet to be sentenced, he added.
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Than Tun, the leader of an aid organisation operating in northern Rakhine, confirmed the sentence, adding: "He is the first one to face such action since the attack."
Myanmar's government said hundreds of Rohingya militants carried out raids on three posts on the Bangladesh border on October 9, killing nine police in a series of coordinated attacks.
The sentencing comes days after a blistering report from the UN accused Myanmar's troops and police of carrying out a campaign of rape, torture and mass killings of Rohingya.
Based on interviews with hundreds of escapees in Bangladesh, investigators said the military's "calculated policy of terror" very likely amounted to ethnic cleansing.
Several hundred Rohingya have also been detained, the UN report said, describing how they were stripped, beaten, tortured and deprived of food and water.
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