Police action has been sought against Miss Universe Thailand Anchilee Scott-Kemmis for standing on what looks like a Thai flag in a picture featured online.
The complaint was filed with police by Sonthiya Sawasdee, a former adviser to the House committee on Tuesday.
Mr Sonthiya accused Anchilee of breaching the 1979 Flag Act and a ban on the use of national flags for commercial purposes.
The picture, which shows the beauty queen posing on painted stripes resembling the colours of the national flag, was released online in a promotional campaign before Anchilee competes in the 70th Miss Universe pageant in Israel on Dec 12.
Mr Sonthiya said Miss Universe Thailand may be unaware that standing on a national flag is inappropriate.
He insisted he would not be seeking any jail terms, but was protecting the prestige of the national flag.
Offences against the national flag carry a maximum jail term of two years, a fine of up to 40,000 baht or both.
