Emotion dysregulation has been considered a key factor for the development, the severity, and the persistence of symptoms in multiple psychiatric disorders (Dvir et al., 2014), such as anxiety disorders, major depression, eating disorders, substance related disorders, borderline personality disorder, and obsessive compulsive disorder (Berking & Wupperman, 2012; See et al., 2022). Thus, improving emotion regulation has been the focus of many cognitive-behavioural psychotherapeutic interventions, such as dialectical behavioural therapy (Linehan, 2014) and schema therapy (Young et al., 2003), as well as psychodynamic interventions (Woll & Schönbrodt, 2020). On the neural level, it has been hypothesized that neural alterations associated with dysfunctional emotion regulation might be associated with impaired top-down control of prefrontal regions over limbic structures (Braunstein et al., 2017; Gyurak et al., 2011). For example, neural differences between psychiatric patients and healthy controls have been reported for fMRI-based connectivity measures between frontal and limbic structures (Baczkowski et al., 2017; De Wit et al., 2015; Fitzgerald et al., 2019; Park et al., 2019). Moreover, dysfunctional emotion regulation has been associated with hyperactivation of the amygdala (Picó‐Pérez et al., 2019; Pizzagalli & Roberts, 2022; Schulze et al., 2016) and hypoactivation of prefrontal brain regions (De Wit et al., 2015; Kjærstad et al., 2022; Mochcovitch et al., 2014). Those alterations in cortico-subcortical networks have been observed in patients diagnosed with obsessive-compulsive disorder (De Wit et al., 2015; Kammen et al., 2022; Picó‐Pérez et al., 2019), bipolar disorder (Kjærstad et al., 2022; Murray et al., 2022), major depression (Ebneabbasi et al., 2021; Park et al., 2019; Pizzagalli & Roberts, 2022), anxiety disorders (Fitzgerald et al., 2019; Mochcovitch et al., 2014), post-traumatic-stress-disorder (Herringa, 2017; Nicholson et al., 2017), borderline personality disorder (Bertsch et al., 2018; Kebets et al., 2021; Schulze et al., 2016), and substance use disorder (Albein‐Urios et al., 2014; Shen et al., 2017; Wilcox et al., 2016). Additional brain regions related to emotion regulation dysfunctions in psychiatric populations are the insula (Gong et al., 2020; Picó-Pérez et al., 2017; Zhang et al., 2022), the anterior cingulate cortex (Davis et al., 2018; Fitzgerald et al., 2019; Le et al., 2021), the orbito-frontal cortex (Kammen et al., 2022; Murray et al., 2022), and the ventral striatum (Kammen et al., 2022; Park et al., 2019; Pizzagalli & Roberts, 2022). To address emotion regulation dysfunction on the neural level, several techniques have been developed and explored for their capacity to modulate neuronal responses and/or to induce neuroplastic processes. Real-time fMRI neurofeedback (rt-fMRI-NF) is a novel technique enabling to visually represent and self-modulate the ongoing changes in specific brain regions, as well as the connectivity between them (Sitaram et al., 2007; Weiskopf et al., 2007). Within neural networks related to emotion regulation, it could be shown that even one session of rt-fMRI-NF resulted in modification of region-specific brain activity (Barreiros et al., 2019; Linhartová et al., 2019; Zhang et al., 2022) and large-scale network connectivity (Orth et al., 2022; Young et al., 2018). Namely, modification of neural activation levels due to rt-fMRI-NF was demonstrated for the amygdala, the prefrontal cortex, the insula, and the anterior cingulate cortex for patients diagnosed with affective disorders (Barreiros et al., 2019; Park et al., 2019; Young et al., 2017), substance use disorder (Dave & Tripathi, 2022; Martz et al., 2020), borderline personality disorder (Herpertz et al., 2018), obsessive compulsive disorder (Buyukturkoglu et al., 2015; Gonçalves Ó et al., 2017), and post-traumatic stress disorder (Barreiros et al., 2019; Chiba et al., 2019; Nicholson et al., 2017). Thus, rt-fMRI-NF might function as a potential therapeutic tool, or as an add-on treatment, that is able to directly target the underlying neural mechanisms of emotion dysregulation. There has been a vastly increasing number of rt-fMRI-NF studies over the past decade (Zhang et al., 2022). However, previous reviews on emotion regulation have primarily addressed methodological aspects of rt-fMRI-NF (Barreiros et al., 2019; Linhartová et al., 2019; Zhang et al., 2022). Yet, there is no systematic review or meta-analysis focussing on the clinical impact of emotion regulation related rt-fMRI-NF. However, evaluating the clinical impact is critical for the decision on whether rt-fMRI-NF may function as a therapeutic tool (Dudek & Dodell-Feder, 2021; González Méndez et al., 2022). Moreover, no systematic assessment of study quality has been conducted by previous reviews.