Do any regulatory bodies require ISO 9001 QMS certification from airlines or service providers? As the aviation industry is transitioning to SMS approach, is having ISO 9001 certification required from any civil aviation authority? Similar to how IATA requires IOSA certification and certain airline /  airport authorities require ISAGO certification for ground handling companies. Note this question is not trying to debate the advantages or disadvantages of ISO 9001 certification towards achieving safety, but rather the presence or non-presence in the regulatory landscape.
No, there are no civil aviation authorities that require QMS implementation.

ICAO documentation (Document 9859) discusses the integration of other systems, such as quality and environmental management systems. There are advantages of integrations, such as facilitating data management and reducing redundancies.

For example, a QMS has many of the same documentation requirements as an SMS, so an integrated system is logical. However, not all operator benefit from an QMS, especially the smaller ones.