A0V

There are two A0V daggers: HD 103287 (gam UMa) & HD 172167 (Vega) 

Morgan65 and Abt68 list HD 103287 (Gam UMa) as its A0V standard.

MK43 lists Alf Lyr (Vega) as their A0V standard. 

Gray87 has an extensive discussion on early A-type standards. Gray 87
lists 5 A0V standards of various flavors: HD 225047 (A0Vb), Alf Lyr
and HD 71151 (A0Va; originally incorrectly listed as "HD 71155", see
erratum), Gam UMa and Chi Cap (A0Van). They consider rapid rotation
(n) to be vsini > 150 km/s.

Garrison67 used Alf CrB as their A0V standard. 

Cowley69 used Alf CrB, Gam Oph, Gam UMa, and 109 Vir as A0V standards.
Cowley72 used Alf CrB, Gam Oph, & Gam UMa as their A0V standards. 

Garrison79 used HR 3314 and HD 147013 as their A0V standards. 

Skiff08 lists only three A0V standards: HD 103287 (MK73), 172167
(MK78), 66656 (MK78). 

Gray01/03/06 list 3 nearby A0Vs. Their median HIP colors:
<B-V>(A0V) = -0.013 (+-0.012 sem, +-0.010 stdev) N=3
<V-I>(A0V) = -0.021 (+-0.011 sem, +-0.010 stdev) N=3
 

# dagger standards
HD 103287 = Gam UMa
  A0V: MK43,JM53,Morgan65,Abt68,Cowley69(stan),MK73,Houk,Garrison94
  A0Van: Gray87(stan),Garrison96
  
  Gray87 uses it as the primary high vsini A0Va standard (from MK78)

HD 172167 = alf Lyr = Vega
  A0V: MK43,JM53,MK73,MK78,Keenan85,Garrison94,GrayAtlas
  A0Va: Gray87(stan),Garrison96
  Gray87 uses it as the primary low vsini A0Va standard (from MK78)

# other standard:
HD 71155 = HR 3314
  A0V: Garrison79(stan)
  A0Vb: Gray87
  Gray87 uses it as a "suitable secondary standard" for A0Va (with Vega the primary)
  See 1988 erratum -- it was incorrectly listed as HD 71151 (phi^2 Cnc) originally. 

HD 225047
  A0Vb: Gray87(stan)

HD 31647 = Ome Aur = 4 Aur = HR 1592
  A0V: JM53

HD 66656 = NGC 2516 29
  A0V: MK78(Vb),Houk75,Cannon(A0),AbtMorgan69
  A0mA1Va: Gray87
  A2V: Jaschek64,Jaschek78

HD 71155 = 30 Mon = C Hya = HR 3314
  A0V: JM53

HD 130109 = 109 Vir = HR 5511
  A0V: JM53, Cowley69(stan)

HD 139006 = Alf CrB = HR 5793
  A0V: MK43,JM53,Garrison67(stan),Cowley69(stan)
  eclipsing binary

HD 140775 = HR 5859
  A0V: JM53

HD 146624 = d Sco = HR 6070
  A0V: JM53

HD 147013
  A0V: Garrison79(stan)

HD 161868 = gam Oph = 62 Oph = HR 6629
  A0V: JM53,Cowley69(stan)

C Hya
  A0V: MK43

# Others
Zet Aql A
  A0Vann: Garrison96