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In this work we report the discovery and analysis of three new triplyeclipsing triple star systems found with the TESS mission during itsobservations of the northern skies: TICs 193993801, 388459317, and 52041148. Weutilized the TESS precision photometry of the binary eclipses and third-bodyeclipsing events, ground-based archival and follow-up photometric data, eclipsetiming variations, archival spectral energy distributions, as well astheoretical evolution tracks in a joint photodynamical analysis to deduce thesystem masses and orbital parameters of both the inner and outer orbits. In onecase (TIC 193993801) we also obtained radial velocity measurements of all threestars. This enabled us to `calibrate' our analysis approach with and without`truth' (i.e., RV) data. We find that the masses are good to 1-3% accuracy withRV data and 3-10% without the use of RV data. In all three systems we were ableto find the outer orbital period before doing any detailed analysis bysearching for a longer-term periodicity in the ASAS-SN archival photometry data-- just a few thousand ASAS-SN points enabled us to find the outer periods of49.28 d, 89.86 d, and 177.0 d, respectively. From our full photodynamicalanalysis we find that all three systems are coplanar to within $1^\circ -3^\circ$. The outer eccentricities of the three systems are 0.003, 0.10, and0.62, respectively (i.e., spanning a factor of 200). The masses of the threestars {Aa, Ab, and B} in the three systems are: {1.31, 1.19, 1.34}, {1.82,1.73, 2.19}, and {1.62, 1.48, 2.74} M$_\odot$, respectively.

Triply eclipsing triple stars in the northern TESS fields: TICs 193993801, 388459317 and 52041148