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We present a catalogue of 4098 photometrically selected galaxy clusters with a median redshift  〈 z 〉= 0.32  in the 270 deg  2  ‘Stripe 82’ region of the Sloan Digital Sky Survey (SDSS), covering the celestial equator in the Southern Galactic Cap ( −50° &lt; α &lt; 59° ,  |δ| ≤ 125 ). Owing to the multi‐epoch SDSS coverage of this region, the  ugriz  photometry is ∼2 mag deeper than single scans within the main SDSS footprint. We exploit this to detect clusters of galaxies using an algorithm that searches for statistically significant overdensities of galaxies in a Voronoi tessellation of the projected sky. 32 per cent of the clusters have at least one member with a spectroscopic redshift from existing public data (SDSS Data Release 7, 2SLAQ and WiggleZ), and the remainder have a robust photometric redshift (accurate to ∼5–9 per cent at the median redshift of the sample). The weighted average of the member galaxies’ redshifts provides a reasonably accurate estimate of the cluster redshift. The cluster catalogue is publicly available for exploitation by the community to pursue a range of science objectives. In addition to the cluster catalogue, we provide a linked catalogue of 18 295   V ≤ 21 ‐mag quasar sightlines with impact parameters within ≤3 Mpc of the cluster cores selected from the catalogue of Veron‐Cetty &amp; Veron (2010). The background quasars cover  0.25 &lt;  z  &lt; 2 , where Mg  ii  absorption‐line systems associated with the clusters are detectable in optical spectra.

4098 galaxy clusters to z ∼ 0.6 in the Sloan Digital Sky Survey equatorial Stripe 82