• Никола Теодосиев, NEMESIS: International Research Network (an international scientific network labeled by Centre national de la recherche scientifique), Член,
• Никола Теодосиев, ‘Saving European Archaeology from the Digital Dark Age’ COST Action 18128 (COST European Cooperation in Science & Technology), Ръководител,
• Никола Теодосиев, ARIADNEplus (European Commission, H2020 Programme), Ръководител,
• Никола Теодосиев, Archaeogenetics of Bulgarian Prehistory and Protohistory. Collaborative Research Project, Член, Stanford University, USA

Книга

• Nikola Theodossiev, A. Falileyev, J. Emilov, “Celtic” Bulgaria. A Select Bibliography., St. Petersburg , Рецензирано, International

Монография

• Nikola Theodossiev, North-Western Thrace from the Fifth to First Centuries BC (= British Archaeological Reports – International Series 859)., Oxford, Ref, Рецензирано

Статия в научно списание

• Nikola Theodossiev, D. Dana, M. Kamiševa, Une signature d’artisan sur le fourreau d’une épée trouvée près de Béroia de Thrace, Zeitschrift für Papyrologie und Epigraphik, issue:199, 2016, Ref, Web of Science, International
• Nikola Theodossiev, E. Fentress, Fasti Online: An Important International Resource on the Archaeological Excavations in Bulgaria, Southeast Europe and the Mediterranean, The Bulgarian Studies Association Newsletter, vol:Volume 1, 2014, International
• Nikola Theodossiev, M. Sikora, M.L. Carpenter, A. Moreno-Estrada, B.M. Henn, P.A. Underhill, F. Sánchez-Quinto, I. Zara, M. Pitzalis, C.D. Bustamante, Population Genomic Analysis of Ancient and Modern Genomes Yields New Insights into the Genetic Ancestry of the Tyrolean Iceman and the Genetic Structure of Europe, PLOS Genetics , vol:10, issue:5, 2014, Ref, Web of Science, International
• Nikola Theodossiev, M. Carpenter, J. Buenrostro, C. Valdiosera, H. Schroeder, M. Allentoft, M. Sikora, M. Rasmussen, S. Gravel, S. Guillén, Pulling Out the 1%: Whole-genome Capture for the Targeted Enrichment of Ancient DNA Sequencing Libraries , American Journal of Human Genetics , vol:93, issue:5, 2013, pages:852-864, Ref, Web of Science, International
• Nikola Theodossiev, Mountain Goddesses in Ancient Thrace: The Broader Context , Kernos, vol:15, 2002, pages:325-329, Ref, Web of Science
• Nikola Theodossiev, ΚΟΤΕΟΥC ΗΛΙΟΥ and ΚΟΤΕΟΥC ΜΗΤΡΟC ΟΡΕΑC , Hermes, vol:129, issue:2, 2001, pages:279-283, Ref, Web of Science
• Nikola Theodossiev, The Dead with Golden Faces. II. Other Evidence and Connections , Oxford Journal of Archaeology , vol:19, issue:2, 2000, pages:175-209, Ref, Web of Science
• Nikola Theodossiev, R. Megaw, V. Megaw, N. Torbov, The Decorated La Tène Sword Scabbard from Pavolche near Vratsa: Some Notes on the Evidence for Celtic Settlement in Northwestern Thrace, Archaeologia Bulgarica , vol:4, issue:3, 2000, pages:25-43, Ref, Web of Science, International
• Nikola Theodossiev, Sanctuaries and Cult Places in Northwestern Thrace during the 1st Millenium B.C. , Archaeologia Bulgarica , vol:2, issue:2, 1998, pages:15-27, Ref, Web of Science
• Nikola Theodossiev, The Dead with Golden Faces: Dasaretian, Pelagonian, Mygdonian and Boeotian Funeral Masks , Oxford Journal of Archaeology , vol:17, issue:3, 1998, pages:345-367, Ref, Web of Science
• Nikola Theodossiev, Two Silver Vessels with Dionysiac Scenes from Thrace , Antiquaries Journal , vol:78, 1998, pages:43-62, Ref, Web of Science
• Nikola Theodossiev, A New Early Thracian Inscription from Bulgaria , Kadmos, vol:36, issue:2, 1997, pages:174-0, Ref, Web of Science
• Nikola Theodossiev, Further Notes on the Mountain Theonyms (Orpheus, Dionysos, Salmoxis, etc.), Beiträge zur Namenforschung (Neue Folge), том:32, брой:4, 1997, стр.:409-416, Ref, Web of Science
• Nikola Theodossiev, On the Reading and Date of the Kjolmen Inscription , Indogermanische Forschungen, vol:102, 1997, pages:216-229, Ref, Web of Science
• Nikola Theodossiev, Cult Clay Figurines in Ancient Thrace: Archaeological Evidence for the Existence of Thracian Orphism, Kernos, vol:9, 1996, pages:219-226, Ref, Web of Science
• Nikola Theodossiev, Semantic Notes on the Theonyms Orpheus, Sabazios and Salmoxis , Beiträge zur Namenforschung (Neue Folge), vol:29 – 30, issue:3, 1995, pages:241-246, Ref, Web of Science
• Nikola Theodossiev, Two Early Alphabetic Inscriptions from Bulgaria , Kadmos, vol:34, issue:2, 1995, pages:163-0, Ref, Web of Science
• Никола Теодосиев, Н. Торбов, Тракийски могили от късноелинистическата епоха при Търнава, Белослатинско , Известия на Музеите в Северозападна България, том:23, 1995, стр.:11-58
• Nikola Theodossiev, The Thracian Ithyphallic Altar from Polianthos and the Sacred Marriage of the Gods , Oxford Journal of Archaeology , vol:13, issue:3, 1994, pages:313-323, Ref, Web of Science
• Nikola Theodossiev, Тракийски могилни гробници при Панагюрище , Археология, том:36, брой:3-4, 1994, стр.:1-6, Ref
• Nikola Theodossiev, М. Манов, Могилно погребение при с. Драгодан, Кюстендилско , Археология, том:35, брой:1, 1993, стр.:31-42, Ref
• Nikola Theodossiev, Трибалите: някои проблеми на историческото им развитие , Исторически Преглед , том:48, брой:2, 1992, стр.:70-84, Ref
• Nikola Theodossiev, Кратерът от Душанци (културно-исторически анализ и интерпретация), Археология, том:33, брой:4, 1991, стр.:13-21, Ref
• Никола Теодосиев, Тракийски надписи от V – ІV в. Опит за проблематицация , Нумизматика, том:25, брой:1-2, 1991, стр.:58-65
• Никола Теодосиев, Тракийски надписи от V – ІV в. Опит за проблематицация (част ІІ) , Нумизматика, том:25, брой:3-4, 1991, стр.:34-47
• Никола Теодосиев, За четенето и датировката на надписа от Кьолмен , Нумизматика, том:24, брой:2, 1990, стр.:3-8

Статия в поредица

• Nikola Theodossiev, Elizabeth Fentress, Fasti Online: Bulgaria , The Classical Association Blog, 2021, International
• Nikola Theodossiev, Archaeology in Bulgaria: Mesambria (Nesebar), Bulgaria Analytica, 2019
• Nikola Theodossiev, Archaeology in Bulgaria: Nicopolis ad Istrum (Nikyup) , Bulgaria Analytica, 2019
• Nikola Theodossiev, Archaeology in Bulgaria: Odessos (Varna), Bulgaria Analytica, 2018
• Nikola Theodossiev, Archaeology in Bulgaria: Philippopolis (Plovdiv) , Bulgaria Analytica, 2018
• Nikola Theodossiev, Archaeology in Bulgaria: From the End of the World War II until the Collapse of the Communism in 1989, Bulgaria Analytica, 2017
• Nikola Theodossiev, Archaeology in Bulgaria: From the End of the 19th Century until the End of the World War II, Bulgaria Analytica, брой:October 24th, 2016, 2016, в сътрудничество с чуждестранни учени
• Nikola Theodossiev, Archaeology in Bulgaria: The Beginnings and the Early Pioneers before the 20th Century, Bulgaria Analytica, брой:September 1st, 2016, 2016, в сътрудничество с чуждестранни учени
• Nikola Theodossiev, Daniela Stoyanova, The Beehive Tomb at Kurt Kale Reconsidered., Studia Archaeologica Univesitatis Serdicensis, Suppl. V, vol:Stephanos Archaeologicos in honorem Professoris Stephcae Angelova, 2010, pages:179-198, ISSN (print):1312-7284, Ref, Web of Science
• Никола Теодосиев, Светилища в Северозападна Тракия през І хил. пр. Хр. , Годишник на Софийския Университет. Исторически Факултет – Studia Archaeologica, брой:2, 1995, стр.:93-101
• Никола Теодосиев, К. Лещаков, Два тракийски глинени олтара с обредни сцени , Годишник на Софийския Университет. Исторически Факултет – Studia Archaeologica, брой:1, 1994, стр.:59-78, Ref

Статия в сборник (на конференция и др.)

• Nikola Theodossiev, The Thracian Tholos Tombs at Ravnogor Reconsidered , Connecting the Ancient West and East. Studies Presented to Prof. Gocha R. Tsetskhladze, editor/s:J. Boardman, J. Hargrave, A. Avram, A. Podossinov, 2022, pages:723-741, Ref, Web of Science
• Nikola Theodossiev, The Thracian Tholos Tomb at Eriklice Reconsidered , Acta Musei Varnaensis 8/1 (= Terra Antiqua Balcanica et Mediterranea. Miscellanea in Honour of Alexander Minchev), 2011, pages:67-84, Ref, Web of Science
• Nikola Theodossiev, Celtic Settlement in North-Western Thrace during the Late Fourth and Third Centuries BC: Some Historical and Archaeological Notes, Celts on the Margin. Studies in European Cultural Interaction 7th Century BC – 1st Century AD. Dedicated to Zenon Woźniak. , editor/s:H. Dobrzańska, V. Megaw and P. Poleska, Publisher:Kraków, 2005, pages:85-92, Ref, Web of Science
• Nikola Theodossiev, The Thracian Monumental Tomb at Rozovets: Re-Examination of an Old Discovery, Studia Archaeologica Universitatis Serdicensis. Supplementum 4 (= Stephanos Archaeologicos in honorem Professoris Lydmili Getov), 2005, pages:677-684, Ref, Web of Science
• Nikola Theodossiev, The Origin of the Thracian Beehive Tholos Tombs , Praktika 11th Diethnous Synedriou Klassikon Spoudon. Tomos 3, Publisher:Athenai, 2004, pages:348-367, Ref
• Nikola Theodossiev, Monumental Tombs and Hero Cults in Thrace during the 5th-3rd Centuries B.C., Kernos Supplément 10 (= Héros et héroïnes dans les mythes et les cultes grecs), editor/s:V. Pirenne-Delforge, E. Suárez de la Torre, 2000, pages:435-447, Ref, Web of Science
• Nikola Theodossiev, M. Manov, Rich Thracian Tumular Grave of Ulkos, Son of Tios , Actes. 2e Symposium International des Etudes Thraciennes. Thrace Ancienne. , Publisher:Komotini, 1997, pages:365-390, Ref

Студия в сборник (на конференция и др.)

• Nikola Theodossiev, Ancient Thrace during the First Millennium BC , The Black Sea, Greece, Anatolia and Europe in the First Millennium BC. Dedicated to Jan Bouzek (= Colloquia Antiqua 1)., editor/s:G.R. Tsetskhladze , Publisher:Leuven – Paris – Walpole , 2011, pages:1-60, Ref, Web of Science, International
• Nikola Theodossiev, The Lantern-Roofed Tombs in Thrace and Anatolia: Some Evidence about Cultural Relations and Interaction in the East Mediterranean, Thrace in the Graeco-Roman World. Proceedings of the 10th International Congress of Thracology., Publisher:Athens, 2007, pages:602-613, Ref, Web of Science
• Nikola Theodossiev, The Beehive Tombs in Thrace and Their Connection with Funerary Monuments in Thessaly, Macedonia and Other Parts of the Ancient World , Ancient Macedonia 7, Publisher:Thessaloniki, 2002, pages:423-444, Ref, Web of Science
• Nikola Theodossiev, Late Hellenistic Aristocratic Burials in the Lands of Triballoi: Some Evidence on Campaigns against the Province of Macedonia , Ancient Macedonia 6/2, Publisher:Thessaloniki, 1996, pages:1151-1173, Ref, Web of Science

• Постер, Никола Теодосиев, Building Persistent Online Open Databases in Archaeology: Bulgarian Perspective and Experience
• Присъствие, Никола Теодосиев, Management Committee and Working Group Meeting
• Присъствие, Никола Теодосиев, Discussion Workshops
• Постер, Никола Теодосиев, Fasti Online – Bulgaria: A Long-Lasting Archaeological Database
• Присъствие, Никола Теодосиев, Management Committee and Working Group Annual General Meeting
• Постер, Никола Теодосиев, Presentation of the international e-journal Fasti Online
• Секционен доклад, Никола Теодосиев, The Lantern-Roofed Tombs in Thrace and Anatolia: Some Evidence about Cultural Relations and Interaction in the East Mediterranean
• Секционен доклад, Никола Теодосиев, The Beehive Tombs in Thrace and Their Connection with Funerary Monuments in Thessaly, Macedonia and Other Parts of the Ancient World
• Секционен доклад, Никола Теодосиев, Mountain Goddesses in Ancient Thrace: The Broader Context
• Присъствие, Никола Теодосиев, The Thracian Tombs in the Kazanlak Valley: Some Evidence for Relations between Thrace, Macedonia and Anatolia
• Секционен доклад, Никола Теодосиев, Thracian Monumental Tombs and the Cult of Ancestors
• Секционен доклад, Никола Теодосиев, The Origin of the Thracian Beehive Tholos Tombs
• Секционен доклад, Никола Теодосиев, Social Aspects of Mortuary Practices in Northwestern Thrace during the 1st Millennium BC
• Секционен доклад, Никола Теодосиев, Death and Rebirth: Religious Aspects of Mortuary Practices in Northwestern Thrace during the Late Iron Age
• Секционен доклад, Никола Теодосиев, The Borovo Pitcher-Rhyton: A Greek Silver Vase with Dionysiac Scenes in Thrace
• Секционен доклад, Никола Теодосиев, Late Hellenistic Aristocratic Burials in the Lands of Triballoi: Some Evidence on Campaigns against the Province of Macedonia
• Секционен доклад, Никола Теодосиев, Cult Clay Figurines in Ancient Thrace: Archaeological Evidence for the Existence of Thracian Orphism
• Секционен доклад, Никола Теодосиев, The Sacred Mountain of the Ancient Thracians
• Секционен доклад, Никола Теодосиев, Rich Thracian Tumular Grave of Ulkos, Son of Tios

• Никола Теодосиев, Colloquia Antiqua, Участие в редколегия
• Никола Теодосиев, Fasti Online, Участие в редколегия