Nikolaos or Lakis Dailakis (Greek: Νικόλαος Νταηλάκης) was a Slavophone Greek revolutionary of the Greek Struggle for Macedonia.

Dailakis was born in the village of Verniki, Monastir Vilayet Ottoman Empire (now Vernik in southern Albania. He was the eldest son of Konstantinos Dailakis. His younger brother was named Ioannis. His great-grandfather, also a Konstantinos Dailakis, had opposed for several years the Albanian Sali Bey, who wished to turn Verniki into his estate. His opposition continued and intensified with the Greek War of Independence. This resulted in a rivalry that would span generations.

In 1900, at the age of 18, Nikolaos Dailakis killed Demir Aga, a descendant of Sali Bey, whose family still ruled Verniki. With fear of retaliation against villagers, Dailakis surrendered and was sentenced to 15 years in prison. However, with the help of his uncle, Elias Kovatsidis, he was released on bail. On his return failed ambush by Demir Aga's family, made him leave the village and enter a life of theft. Until the end of 1901, he targeted local Ottoman dynasties in collaboration with the Internal Macedonian Revolutionary Organization. In 1902, he met Konstantinos Kottas Christou in Korestia became a Makedonomachos under his command and fought against Bulgarian groups and Ottoman forces. With an increase in Bulgarian attacks on Greek villages, Nikolaos Dailakis, with the assistance of his father, Konstantinos, who was a prefect in Verniki, set up a network of organizations in the regions of Korestia, Prespa, and Devolis to protect Greeks and Greek interests.

Following the failed Ilinden–Preobrazhenie Uprising and the unfavourable conditions it had produced for the Greeks and other Christian populations, Nikolaos Dailakis traveled to boost morale and revitalize the Greek organizations of the region. With the Bulgarians having turned on the Greeks following the uprising, they had begun to terrorize the Greek population and had committed brutal killings and torture of several relatives and friends of Dailakis and Kottas. The two Makedonomachoi took revenge a few days later by killing Komitadji, Dine Yannev, and arresting Lazar Poptraykov, sentencing him to death (he later escaped).

After the death of Kottas in 1904, Nikolaos Dailakis would get in contact with many other chieftains, regional Greek elites, and church officials to organize armed resistance groups. He then went to Kastoria where he had meetings with Germanos Karavangelis to discuss the resistance of Bulgarian pressure to join the Exarchate. There he also managed to derail a network of IMRO Exarch informants.

In early 1905, Nikolaos Dailakis arrested and executed Komitadji Christos Sapkarov and raided a Bulgarian hideout with other Chieftains such as Georgios Tsontos. In April, he was involved in smuggling and in procuring Mannlicher rifles and ammunition for the Makedonomachoi. Throughout the rest of the year, he was involved in many clashes with the Bulgarians, Ottomans, and even an Albanian armed group, and was successful in eliminating several Bulgarian sympathizers. The efforts of Dailakis resulted in the intensified use of the resources of his opponents, and many attempts were made on his life.

In 1907, he left for Athens for the arrangement of weapon procurements and on his return, exterminated the Romanian Tsakamakas, who were partially responsible for the betrayal that resulted in the death of Pavlos Melas in 1904. He was eventually arrested by Ottoman authorities but was given amnesty following the Young Turk Revolution. Upon his release, he was marked for assassination by the Turkish organization "Cemiet", leaving him under constant pursuit.

During the struggle he was also ransomed by the local Ottoman landlord Hussein bey, but despite his hideout near Hoçisht was surrounded, he managed to escape.