The Swift/UVOT began settled observations of the field of GRB 100305A 144s after the BAT trigger (Troja et al., GCN 10470). Data summed from the first and second orbits do not reveal a source at the enhanced position of the X-ray afterglow (Osborne et al., GCN 10474) or the candidate afterglow reported by Cucchiara et al. (GCN 10473). The 3-sigma upper limits for the finding chart (fc) and summed exposures are reported below: FILTER T_start(s) T_stop Exposure Mag/3UL ======================================================== white fc 144 266 120 > 20.60 white 4636 4836 196 > 21.10 v 3612 5247 393 > 19.85 b 4432 6048 373 > 20.68 u 4227 5863 393 > 20.45 uvw1 4022 5656 393 > 20.46 uvm2 3817 5451 393 > 20.2 uvw2 4842 5042 196 > 20.17 ======================================================= The above magnitudes are not corrected for the Galactic extinction corresponding to a reddening of E_{B-V} = 0.01 (Schlegel et al., 1998, ApJS, 500, 525). The photometry is on the UVOT photometric system described in Poole et al. (2008, MNRAS, 383, 627).