We present BV photometry for 54 variables in the metal-rich inner halo globular cluster NGC 6723. With the discovery of new RR Lyrae variables (RRLs), we obtain P ab = 0.541 ± 0.066 and P c = 0.292 ± 0.030 day, n(c)/n(ab+c) = 0.167, and V(RR)int = 15.459 ± 0.055. We carry out the Fourier decomposition analysis and obtain [Fe/H]ZW = –1.23 ± 0.11 and E(B – V) = 0.063 ± 0.015 for NGC 6723. By calibrating the zero point from the recent absolute trigonometric parallax measurements for RR Lyr, we derive the revised MV(RR)-[Fe/H] relation, providing MV(RR) = 0.52 at [Fe/H] = –1.50 and (m – M)0 = 18.54 for the Large Magellanic Cloud, in excellent agreement with others. We obtain (m – M)0 = 14.65 ± 0.05, equivalent to a distance from the Sun of 8.47 ± 0.17 kpc, for NGC 6723 from various distance measurement methods using RRLs. We find that RRLs in NGC 6723 do not have magnitude dependency on the radial distance because there is not a severe degree of apparent crowdedness. Finally, we show that a relation exists between the degree of photometric contamination and the apparent crowdedness of the central region of globular cluster systems, . The use of this relation can play a significant role in mitigating the discrepancy in establishing a cosmic distance scale using RRLs in resolved stellar populations in near-field cosmology
