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We present the fiducial sequences of a sample of Galactic star clusters inthe five bands of the Pan-STARRS1 (PS1) photometric system (g_P1, r_P1, i_P1,z_P1, y_P1). These empirical sequences -- which include the red giant andsub-giant branches, the main sequence, and the horizontal branch -- weredefined from deep colour-magnitude diagrams reaching below the oldestmain-sequence turn-offs of 13 globular and 3 old open clusters covering a widerange of metallicities (-2.4 < [Fe/H] < +0.4). We find excellent agreement forthe nine clusters in common with previous studies in similar photometricsystems when transformed to the PS1 system. Because the photometric andspectroscopic properties of these stellar populations are accurately known, thefiducials provide a solid basis for the interpretation of observations in thePS1 system, as well as valuable constraints to improve the empiricalcolour--$T_{eff}$ relations.

Galactic Globular and Open Cluster Fiducial Sequences in the Pan-STARRS1 Photometric System