I'm not qualified to talk about flags or anything, I just think they're neat and felt the desire to share some. Also, it's difficult to find SVGs for some flags, so if I couldn't find one, I made one myself.
A compass rose on a an ocean blue background, as if indicating the "four corners" of the world and that which lies in between.
The word aUI, written in white in its own script, inscribed within a white circle, placed upon a black background, as if it were a star in the night sky.
A green flag with a white canton featuring a green star. Simple and highly recognizable.
An arrangement of overlapping circles seen in artwork across the world, here forming a flower of sorts; it lies upon a white chevron that extends across the blue background.
A curious arrangement of blue circles and lines on a neon green flag that evokes a vague sense of sci-fi.
Upon a sky blue flag rests this white, 6 pointed star, with the topmost and two bottom-corner-facing points stretched out further than the rest. A very kiki-esque design, in my opinion.
A four-pointed white star reaches the edges of this flag as it divides it into quadrants whering the top two are blue and the bottom two are red.
A flag is diagonally divided what could be described as four chevra, in clockwise order from the top, blue, white, red, yellow; four colors oft seen in the flags of the slavic lands.
The sun, yellow with 16 equal-spaced rays, representing the 15 source languages and Jitsama itself, separated from the circular middle by a border the same color as the sky which serves as the background. A nice and succinct way to convey the idea "We all live under the same sun".
Five horizontal stripes, from top to bottom, lime green, red, white, baby blue, yellow.
Across this harsh blue flag stretches a yellow stripe from the bottom right to the top left is split in the middle by a blue circle outlined by a thin yellow border.
Although not intended to be a flag, this pretty logo consists of an Afro-eurasian-centered globe surrounded by 12 circles that form a kind of rainbow.
Strongly taking after Seychelles, this 5 colored flag opts for a pleasing rainbow of blue, green, yellow, orange, red.
Another logo, not intended to be, but often touted as, a flag. Still, the arrow's association with mathematics and the venn diagram's association with logic, as well as possibly the former's resemblance to a compass rose and the latter's to the two hemispheres of a globe serve well to sell this as a neutral loglang.
A blue flag with a horizontal white stripe in the middle, and a white circle in the center, featuring a blue-lined circle, itself broken up by four orange white-lined circles. A very pleasing design, I say.
In the creator's own words:
This is the flag of Manmino.
The azure background symbolizes the hope all auxlangs share of being universal, while also alluding to the fact that there are often East Asian languages that don't distinguish blue and green but see it as one color.
The red symbolizes the bloody history of the region
The white symbolizes the purity that can be redeemed from within the history of war against one another
The gold symbolizes the value of humanity
The twelve is a significant number across Asia
-Lyu Banya, 2021
Beutiful in appearance and meaning, truly.
Called ugly by its own creator, this red flag features two overlapping blue circles that turn red in their overlapping area. In the top right is the yellow outline of a star that partially touches one of the circles. I think it's a bit messy, but still kinda cool.
Two inwardly red curved squares with an orange overlap look kinda like the sun on this white flag.
On this yellow flag one find a thick black outline of the basic shape of the popular yin-yang symbol, oft associated with Daoism. Yet again, however, it would seem to be that this is a logo slapped onto a rectangle and called a flag; my understanding is that the goal of no flag was to "keep Occidental as a functional thing instead of an identity."
In a navy blue space, one spots this abstraction of the earth with a white equals sign. Pretty on-the-nose, but not bad.
In a shocking turn of originality, this triangular purple flag is home to four smaller white triangles in a formation that forms a small purple square.
I'm pretty sure this assortment of white lines and shapes on this brown background is in reference to something specific, but having done little to no research, I couldn't say what.
This wasn't supposed to be a flag, and to be crass, it barely qualifies as a logo; an arrangement of lines in a circle given the MS paint bucket treatment. Still, graphic design isn't easy, and to put any effort at all forth still deserves recognition.
I Googled "Solresol Flag" and found something that looked like this, and I thought I could do better. I'm quite satisfied with the result.
The official logo of toki pona, "toki pona" written in sitelen pona, upon an almost white blue background often associated with toki pona; fairly close to an official flag.
A dark orange star on a bright teal background. It's simple, but not very easy on my eyes.
Volapuk was made in a time prior to the modern craze of "language has flag" seen throughout the conlang community, so this unofficial flag is much newer than the language itself. It's purple with a light yellow canton featuring a globe shape abstraction; fairly obviously taking some notes from esperanto.