The flag of Indiana was designed by Paul Hadley and officially adopted by the state of Indiana on May 31, 1917. It was the state's first official flag and has remained unchanged since then except for the creation of a statute to standardize the production of the flag.
The flag consists of a gold torch that represents liberty and enlightenment; the rays around the torch represent their far-reaching influence. The nineteen stars represent Indiana's place as the nineteenth state to join the United States. The thirteen stars in the outer loop symbolize the original Thirteen Colonies, the five inner stars represent the next five states added to the Union, and the one large star above the torch represents Indiana.
The “Clark” flag flew in Vincennes, Indiana, in 1778. When George Rogers Clark led a company of Virginia militia to take British forts in the Ohio valley, the French community at Vincennes supported him. Clark sent Captain Leonard Helm to take command of the fort there, and Helm likely designed the flag. At least two flags with this design flew in Vincennes during Helm's time in command. The Indiana Society of the Sons of the American Revolution have adopted the flag, and in 2008 presented one to the Indiana National Guard to take with them to Iraq.
Indiana State Flag Symplistic Proposal. I simplified the existing Indiana flag by removing everything but the torch of liberty. I adjusted the colors to make them cohesive with the new scheme. The star represents the state itself. By Ed Mitchell. 2013.
IN flag proposal "5thEye"
Indiana flag proposal by Tim Ritz. Textless version.
Indiana flag redesign proposal, by Eric B. Williamson, dubbed "Liberty's Torch"
Re-Spaced Stars - up-dated torch. Each star has a ray. Design by Rotten Ali.
A modified version of a design by Andy Rash. Posted by Ken Morton.
Crossed bars in the official state colors abstractly represent Indiana as the “Crossroads of America.“ Posted by Preston Knapp 
Proposal for a flag for Indiana based on the current flag. By Qaz Dec 2019 (details)
Part of a series of fifty state flag designs, all in blue and white. (Posted by Ken Morton)
Flag redesign by LordLazyy, utilizing the chequered racing flag while keeping the torch. 18 squares represent the states admitted before Indiana, with the star in the torch representing Indiana herself. Same colors as the current Indiana flag with added black and white, aspect ratio 3:7, Jan 2021