Thomas Osano (born 4 June 1970) is a Kenyan former long-distance runner who competed across track, road, and cross country running disciplines.

Osano ran extensively in professional road races and among his victories were the Route du Vin Half Marathon, CPC Loop Den Haag, Bay to Breakers and Bolder Boulder.

Osano competed for Kenya at an early age and as a junior athlete he shared in a team silver at the 1987 IAAF World Cross Country Championships (led by winner Wilfred Kirochi) before returning in 1989 to finish fourth and help Kenya to the team title alongside individual medallists Kipyego Kororia and Stephenson Nyamau.

[4] At the Bislett Games in Norway in July he recorded a lifetime best of 27:28.87 minutes for the 10,000 m. Although this only brought him third at the competition, it made him the fifth fastest runner over the distance that year.

[9] He finally topped the podium in the event at the All-Africa Games later that month, beating fellow Kenyan William Koech by a narrow margin.

[4] He began 1994 with a win at the Fukuoka International Cross Country and then moved on to American road races, though he was less successful on this occasion and his best results were runner-up placings at the Azalea Trail and Cherry Blossom 10-Miler.

These took in wins at the CPC Loop Den Haag, Parelloop (a career best for the 10K run at 28:02 minutes), Bay to Breakers, Tilburg Ten Miles and Route du Vin Half Marathon.