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SU UMa stars are characterized by "superoutbursts" which are brighter atmaximum light and which last much longer than the more frequent "ordinary"outbursts of these dwarf novae. Although there are now more than 1180 SU UMatype dwarf novae catalogued, our knowledge on their superoutburst cycle lengthCso was hitherto limited to about 6$\%$ of the entire sample of known SU UMastars. Using public data bases we have determined new Cso values for a total of206 additional SU UMa stars in the range 17 d $<$ Cso $<$ 4590 d (includingsome ER UMa and WZ Sge type representants) within total time intervals between2 and 57 years, and with an estimated uncertainty of $\pm$11$\%$. This way, weare increasing our present knowledge of Cso values by a factor $\sim$3.8. Itsdistribution is characterized by a broad maximum around Cso $\approx$ 270 days,and slowly decreasing numbers till Cso $\approx$ 800 d. The domain Cso $>$ 450d was unexplored until now; we add here 106 cases ($\sim$51$\%$ of our totalsample) in this range of long cycles, implying a better statistical basis forfuture studies of their distribution. Our sample contains 16 known WZ Sgestars, and we propose WZ Sge membership for 5 others hitherto classified asordinary SU UMa stars. Individual superoutburst timings deviate in averageabout $\pm$7$\%$ of the cycle length from their overall linear ephemeris,conrming a pronounced quasi-periodic repeatability of superoutbursts. Allrelevant parameters are listed with their errors, and a table with individualsuperoutburst epochs of our targets is given, enabling future researchers tocombine our results with other (past or future) observations.

Determination of the superoutburst cycle lengths of 206 SU UMa type dwarf novae