<p>Under mixed-mode loading conditions, fatigue failure of structures has depicted exceptional interest for its proximity to true engineering structures situations. Furthermore, the standard fracture test procedures for determination material’s fracture toughness are usually intended under pure mode I or for loading in tensile mode. Asserting a crack growth criterion under mixed mode conditions is vital for actual structural applications. Under such conditions, not only the direction of crack extent is important but also the rate of fatigue crack propagation. A number of parameters were proposed to cite fatigue crack growth rates under mixed-mode loading. For real structures or products, cyclic forces of various natures may be imposed upon a wide scale of conditions. The investigation of failure paths and crack instability criteria in mixed-mode failure scenarios presents significantly greater challenges than those encountered in pure mode I failure conditions. In this review, the most important fatigue crack growth rate correlations will be covered to identify how cracks grow under mixed-mode loading. A comprehensive examination of the relevant literature has been conducted. These parameters play a fundamental role in understanding fatigue crack growth rate phenomena and will contribute significantly to the development of enhanced safety and reliability in structural components across diverse industrial applications.</p>