Here are my best picks for anime like Mobile Suit Gundam: Iron-Blooded Orphans. Not all the Gundam series are like this one, so I will only recommend the ones that are the most similar to it. Enjoy!
The year is Correct Century 2345. The civilization of Earth is at about the level it was during World War I. Long ago, humanity traveled through space, but the people of Earth have long forgotten about that. However, an advanced civilization still exists in cities on the moon, and now this Moonrace, in desperate need of resources, sets its sights back on its home planet. Three Moonrace teenagers, Loran Cehack, Keith Laijie, and Fran Doll, are sent to make sure that a return is even feasible, and are followed two years later by the invading Dianna Counter forces. Now, five thousand years after humanity first traveled into space, a new war is brewing between the Earthlings defending their homes, the Moonrace looking to settle on Earth, and other members of the Moonrace who believe a return to Earth may revive a nightmare from humanity’s forgotten past…
In a faraway future, mankind lives underground in huge caves, unknowing of a world above with a sky and stars. In the small village of Jiha, Simon, a shy boy who works as a digger discovers a strange glowing object during excavation. The enterprising Kamina, a young man with a pair of rakish sunglasses and the passion of a fiery sun, befriends Simon and forms a small band of brothers, the Gurren Brigade, to escape the village and break through the ceiling of the cave to reach the surface, which few believe exist.
The village elder won’t hear of such foolishness and punishes the Brigade. However, when disaster strikes from the world above and the entire village is in jeopardy, it’s up to Simon, Kamina, a girl with a big gun named Yoko, and the small yet sturdy robot, Lagann, to save the day. The new friends journey to the world above and find that the surface is a harsh battlefield, and it’s up to them to fight back against the rampaging Beastmen to turn the tide in the humans’ favor! Pierce the heavens, Gurren Lagann!
Bonus Read: Top 10 Most Powerful Gundam Pilots
The inhabitants of the continent of Cruzon are born with the ability to freely control quartz. Technology based on this power allows them to perform a great multitude of tasks such as shoot projectiles and pilot mobile suits (called Golems in this society). Rygart Arrow is an un-sorcerer, a rare individual who is unable to levitate even the smallest crystal. Living with his brother at a farm, he receives a letter from an old friend, Hodr, the current king. Close companion of the king and queen when they were students at Assam Military School, Arrow is informed that a war is about to occur. Hodr called him because an ancient type of Golem has been found in a mining shaft. No one has been able to move it and Queen Sigyn, an expert engineer, suspects that maybe an un-sorcerer might be the key to activate it.
It is the year A.D. 2307. Fossil fuels on Earth have been depleted entirely, with mankind turning to the next available power source: solar energy. During this time, 3 orbital elevators with solar power generation systems are built, each under control by the Union of Solar Energy and Free Nations (formerly United States of America), the Human Reform League (Russia, China and India) and the Advanced European Union. However, not all countries are able to enjoy the benefits of this system, leading to widespread resentment and war. Arising out of the conflict, a mysterious military organization known as Celestial Being appears, dedicated to end all warfare using Mobile Suits called Gundam. This begins the stories of Gundam Meisters (pilots) Setsuna F. Seiei, Lockon Stratos, Allelujah Haptism and Tiera Erde as they are thrown into conflict between the 3 superpowers and the various other factions.
U.C. 0079 – In the middle of the One Year War, Ensign Shiro Amada is transferred to South East Asia to command Kojima Batallion’s 08th MS Team, a small army of soldiers piloting RX-79[G] Gundam Ground type units. During the skirmishes in the jungle, he confronts ace Zeon pilot Norris Packard and falls in love with Aina Sahalin, a pilot involved in testing Zeon’s top-secret mobile armor. This relationship leads to the Federation doubting their trust in Shiro. Now Shiro must prove his loyalty in the battleground or die a traitor.
It is the year After Colony 195, and war between the Space Colonies and Earth has begun. To give the colonies an edge, they send 5 young soldiers, trained to perfection, to earth in the most powerful of Mobile Suits-Gundams. With their arrival, the tide of the war changes as they battle against the Earth forces and the Colonies of their origin.
In 1972, the Apollo 17 mission discovered a hypergate to Mars on the surface of the moon. Soon a war breaks out between Earth and Mars, and Martian soldiers begin to descend from the sky, riding steel giants, intent on exterminating humanity.
U.C. 0083: Three years after the end of the catastrophic One Year War, peace on Earth and the colonies is shattered by the presence of the Delaz Fleet, a rogue Zeon military group loyal to the ideals of the late dictator Gihren Zabi. Delaz Fleet’s ace pilot Anavel Gato, once hailed as “The Nightmare of Solomon”, infiltrates the Federation’s Torrington base in Australia and steals the nuclear-armed Gundam GP02A “Physalis” prototype. Rookie pilot Kou Uraki—with the aid of Anaheim Electronics engineer Nina Purpleton and the crew of the carrier Albion—takes control of the Gundam GP01 “Zephyranthes” prototype in an attempt to recover the stolen Gundam unit and prevent another war from breaking out.
References: Wiki, MyAnimeList, ANN