The Eastern Sabah Security Zone (ESSZONE) is a security zone in the Malaysian state of Sabah that was launched by Malaysian Prime Minister Najib Razak on 25 March 2013 following persistent attacks by pirates and militants from the southern Philippines that occurred in the eastern part of Sabah especially after the 2013 Lahad Datu standoff. It includes the districts of Kudat, Kota Marudu, Pitas, Beluran, Sandakan, Kinabatangan, Lahad Datu, Kunak, Semporna and Tawau, which is neighbouring to the Philippines.

The cross border attacks in Sabah are a series of cross border terrorist attacks perpetrated by Moro pirates from Mindanao, Philippines, in the state of Sabah, Malaysia, that began even before the British colonial period. Many civilians have died or suffered during these incidents, causing an increase in anti-Filipino sentiment among the native peoples of Sabah, especially after major attacks in 1985, 2000 and 2013. The attacks were more intense during the presidential terms of Diosdado Macapagal and Ferdinand Marcos, who supported irredentist claims to include eastern Sabah as part of the Philippines territory. In addition, recent infiltration and attacks by militants as well as uncontrolled human migration from Mindanao to Sabah has led to more unease sentiments among the local residents of Sabah, with around 78% of prison inmates that were caught in the state due to involvement in criminal activities and lawlessness issues mainly originating from the southern Philippines.