AstroLLaVA is a vision language model for astronomy that enables interaction with astronomical imagery through natural dialogue.It is fine-tuned on a diverse dataset of approximately 30k images with captions and question-answer pairs.AstroLLaVA is capable of answering open-ended questions about astronomical concepts depicted visually.The model weights, code, and training set of AstroLLaVA are released for further open-source work in the field of astronomy.