The question of why creativity lacks effective integration in education deserves further exploration, especially regarding its various forms and contexts. This systematic review analyzes the literature on factors influencing K-12 creative teaching until 2022, focusing on two facets: (a) diverse forms (for, with, integrated), and (b) the ecological system (individual, micro, meso, exo, macro) of creative teaching. Key findings reveal: (1) a predominant emphasis on the for form; (2) factors emphasize the individual system, such as teachers’ beliefs and attitudes; (3) environmental factors shift from positive to negative across micro to macro systems. Implications for practice and future research are discussed.