There are a variety of synonyms for the phrase "in office", each of which can be used to indicate that someone is currently holding an official position or job. Some possible alternatives include "currently employed", "serving as", "holding the position of", "occupying the role of", "acting as", "functioning as", "working as", and "on the job". These phrases can be used in a wide range of contexts, from discussing political leaders and government officials, to describing individuals who hold jobs in various industries and professions. Whatever the situation, using a synonym for "in office" can add variety and nuance to your writing or conversation.