We address the task of ontology learning by combining the structured NeOn methodology framework with Large Language Models (LLMs) for translating natural language domain descriptions into Turtle syntax ontologies. The main contribution of the paper is a prompt pipeline tailored for domain-agnostic modeling, exemplified through the application to a domain-specific case study: the wine ontology. The resulting pipeline is used to develop NeOn-GPT, a workflow for automatic ontology modeling, and is integrated into the metaphactory platform. NeOn-GPT leverages the systematic approach of the NeOn methodology and LLMs’ generative capabilities to facilitate a more efficient ontology development process. We evaluate the proposed approach by conducting comprehensive evaluations using the Stanford wine ontology as the gold standard. The obtained results show that LLMs are not fully equipped to perform procedural tasks required for ontology development and lack the reasoning skills and domain expertise needed. Overall, LLMs require integration into workflow or trajectory tools for continuous knowledge engineering tasks. Nevertheless, LLMs can significantly alleviate the time and expertise needed. Our code base is publicly available for research and development purposes, accessible at: https://github.com/andreamust/NEON-GPT.