Right-handers Chris Lambert and Bob McCrory, left-hander Chris Waters, catcher Guillermo Rodriguez and infielder Justin Turner were recalled from Triple-A Norfolk.
The pitchers will work out of the bullpen, while Rodriguez will back up Matt Weiters and Chad Moeller.
"They give us the inventory, so I don't have to keep going to the same guy night after night," manager Dave Trembley said. "Some of those guys that have been here all year, they've had a lot of appearances. I think you'd like to take a look at some of the guys who have just come up and see where they would fit for the future, and maybe move some guys around and put some guys in different situations. It gives us some options so you don't tax guys too much."
For Turner, who was acquired in a trade with the Reds in the offseason, it is his first time on a big league roster.
"It feels real good," said Turner, who turns 25 in November. "It's something you work for your whole life and dream about as a kid. To finally get here is indescribable."
In 108 games for Norfolk, Turner hit .300 with two home runs and 43 RBIs, playing 80 games at second base, 15 at third and 14 at shortstop.
"I told him to take ground balls at second and third," said Trembley. "He'll be a right-handed bat for us off the bench. He's someone who is a baseball player, a scrapper. He gives us some versatility. He can fill in for [second baseman Brian] Roberts, spell [third baseman Melvin] Mora. [He's a] pretty good baseball player."
One of the things Turner, who was selected by the Reds in the seventh round of the 2006 First-Year Player Draft out of Cal State-Fullerton, worked on this season was being more consistent at the plate.
"Taking good at-bats, staying in the strike zone," Turner said. "I did a lot better job putting the ball in play this year, not striking out as much. I think it gave me a better chance to get hits."
Turner was acquired by the Orioles on Dec. 9, 2008, in a trade with the Reds that also brought Brandon Waring, who was recently named the Carolina League Most Valuable Player, sending catcher Ramon Hernandez to Cincinatti.
"I was just excited about the trade and getting over to the organization and getting a fresh start," Turner said. "Then I went out and had a pretty good Spring Training and didn't know what was going to happen after that. I didn't even know if I was going to make the Triple-A club actually until the last day. After that happened, I went out and struggled early and then got it together and wound up turning in a pretty good year. I was just fortunate I got a chance to be up here right now."
Turner had an inkling he may get called up, but he wasn't sure until Monday.
"It was just excitement," Turner said of his reaction. "I didn't know what to think at first, because they said, 'Oh maybe, we don't know yet 100 percent.' Then they handed me the itinerary and at that point, I knew, obviously, it was for sure. So I was excited. I called my parents and family."
His parents took a red-eye flight from Los Angeles on Monday night, arriving in Boston at 5 a.m. ET to be at Fenway Park in time to see his first professional game on a Major League roster.
"I couldn't even describe it," Turner said of being in a big league clubhouse for the first time. "Just sitting in here with all these guys. The coolest part is a lot of these guys I played with earlier in the year at Norfolk. It makes it a little more comfortable for me being in the locker room."
Maureen Mullen is a contributor to MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.