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Globular clusters at the distance of M31 have apparent angular sizes of a fewarcseconds. While many M31 GCs have been detected and studied from ground-basedimages, the high spatial resolution of HST allows much more robust detectionand characterization of star cluster properties. We present the results of asearch of 157 HST/WFPC2 images of M31: we found 82 previously-catalogedglobular cluster candidates as well as 32 new globular cluster candidates and20 open cluster candidates. We present images of the new candidates andphotometry for all clusters. We assess existing cluster catalogs' completenessand use the results to estimate the total number of GCs in M31 as 460+/-70. Thespecific frequency is S_N = 1.2+/-0.2 and the mass specific frequency T =2.4+/-0.4; these values are at the upper end of the range seen for spiralgalaxies.Comment: Accepted to AJ. 33 pages with 6 figures, plus 4 separate figure

M31 Globular Clusters in the [ITAL]HUBBLE SPACE TELESCOPE[/ITAL][ITAL]Hubble Space Telescope[/ITAL] Archive. I. Cluster Detection and Completeness