The phrase "speaking of" is commonly used to transition or connect a conversation to a related topic. However, there are several synonyms that can be used to achieve the same result. Some alternatives to "speaking of" include "related to," "regarding," "in regards to," "concerning," "on the subject of," "with regard to," and "pertaining to." Choosing an appropriate synonym can make your communication more varied and effective. Next time you need to make a connection to a related topic, try using a different synonym to avoid sounding repetitive.