  We have carried out a search for above-horizontal-branch (AHB) stars--objects
lying above the horizontal branch (HB) and blueward of the asymptotic giant
branch (AGB) in the color-magnitude diagram--in 97 Galactic and seven
Magellanic Cloud globular clusters (GCs). We selected AHB candidates based on
photometry in the $uBVI$ system, which is optimized for detection of
low-gravity stars with large Balmer jumps, in the color range
$-0.05\le(B-V)_0\le1.0$. We then used $Gaia$ astrometry and Gaussian-mixture
modeling to confirm cluster membership and remove field interlopers. Our final
catalog contains 438 AHB stars, classified and interpreted in the context of
post-HB evolution as follows: (1) AHB1: 280 stars fainter than $M_V=-0.8$,
evolving redward from the blue HB (BHB) toward the base of the AGB. (2)
Post-AGB (PAGB): 13 stars brighter than $M_V\simeq-2.75$, departing from the
top of the AGB and evolving rapidly blueward. (3) AHB2: 145 stars, with
absolute magnitudes between those of the AHB1 and PAGB groups. This last
category includes a mixture of objects leaving the extreme BHB and evolving
toward the AGB, and brighter ones moving back from the AGB toward higher
temperatures. Among the AHB1 stars are 59 RR Lyrae interlopers, observed by
chance in our survey near maximum light. PAGB and AHB2 stars (including W
Virginis Cepheids) overwhelmingly belong to GCs containing BHB stars, in
accordance with predictions of post-HB evolutionary tracks. We suggest that
most W Vir variables are evolving toward lower temperatures and are in their
first crossings of the instability strip. Non-variable yellow PAGB stars show
promise as a Population II standard candle for distance measurement.
