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We report the discovery of a compact triply eclipsing triple star system inthe southern continuous viewing zone of the TESS space telescope. TIC 278825952is a previously unstudied, circular eclipsing binary with a period of 4.781days with a tertiary component in a wider, circular orbit of 235.55 days periodthat was found from three sets of third-body eclipses and from lighttravel-time effect dominated eclipse timing variations. We performed a jointphotodynamical analysis of the eclipse timing variation curves, photometricdata, and the spectral energy distribution, coupled with the use of PARSECstellar isochrones. We find that the inner binary consists of slightly evolved,near twin stars of masses of 1.12 and 1.09 $M_\odot$ and radii of 1.40 and 1.31$R_\odot$. The third, less massive star has a mass of 0.75 $M_\odot$ and radiusof 0.70 $R_\odot$. The low mutual inclination and eccentricities of the orbitsshow that the system is highly coplanar and surprisingly circular.

TIC 278825952: a triply eclipsing hierarchical triple system with the most intrinsically circular outer orbit