The survival and productivity of plants largely depend on their ability to adapt to different environmental stresses. In recent years, microRNAs (miRNAs), small non-coding RNAs (18–24 nucleotides), have emerged as key genetic regulators in plants. These miRNAs play a crucial role in managing plant development, particularly under challenging conditions. The discovery of miRNAs has been made easier through both experimental methods and bioinformatics techniques, revealing their widespread presence and diverse functions among plant species. Abiotic stresses like extreme temperatures, varying light conditions, drought, nutrient deficiency, salinity, and heavy metal exposure trigger specific miRNAs. These miRNAs then target genes that play roles in numerous biological processes, particularly those related to stress responses and defense mechanisms. Exploring the regulatory functions of miRNAs holds significant potential to enhance crop resilience amid shifting environmental conditions. Manipulating miRNA expression offers the potential for creating crop varieties that are more resilient to stress. Techniques such as CRISPR-mediated gene editing, artificial miRNA expression, and targeted delivery of pre-miRNAs or mature miRNAs have shown the potential to modulate miRNA levels and improve stress resistance in plants. Despite significant progress, challenges remain to completely appreciate the functional roles of miRNAs in different plant species and stress contexts. Future research should aim to investigate new miRNAs, their target genes, and their regulatory networks to fully harness their potential for enhancing crop productivity and promoting sustainable agriculture in a shifting climate.