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    Odehnal, Boris
      Some triangle centers associated with the circles tangent to the excircles, 10 (2010) 35--40.
    Odom, Lucy H.
      (with W. G. Boskoff and B. D. Suceava) An elementary view on Gromov hyperbolic spaces, 12 (2012) 283--286.
    Okumura, Hiroshi
      (with M. Watanabe) The Archimedean circles of Schoch and Woo, 4 (2004) 27--34.
      (with M. Watanabe) The twin circles of Archimedes in a skewed arbelos, 4 (2004) 229--251.
      (with M. Watanabe) The arbelos in $n$-aliquot parts, 5 (2005) 37--45.
      (with M. Watanabe) A generalization of Power's Archimedean circles, 6 (2006) 103--105.
      (with M. Watanabe) Characterizations of an infinite set of Archimedean circles, 7 (2007) 121--123.
      (with M. Watanabe) Remarks on Woo's Archimedean circles, 7 (2007) 125--128.
      More on twin circles of the skewed arbelos, 11 (2011) 139--144.
      A note on Haga's theorems in paper folding, 14 (2014) 241--242.
      Archimedean circles related to the Schoch line, 14 (2014) 369--370.
      Two pairs of Archimedean circles derived from a square, 16 (2016) 23--24.
    Olah-Gal, Robert
      (with J. Sandor) On trigonometric proofs of the Steiner-Lehmus theorem, 9 (2009) 155--160.
    Oller-Marcen, Antonio M.
      The f-belos, 13 (2013) 103--111.
      Archimedes' arbelos to the n-dimension, 16 (2016) 51--56.
    Ong, Darren C.
      On a theorem of intersecting conics, 11 (2011) 95--107.
    Opincariu, Mihai
      (with D. Marinescu, M. Monea and M. Stroe) A sequence of triangles and geometric inequalities, 9 (2009) 291--295.
    Osinkin, Sergey F.
      On the existence of a triangle with prescribed bisector lengths, 16 (2016) 399--405.
    Oxman, Victor
      On the existence of triangles with given lengths of one side and two adjacent angle bisectors, 4 (2004) 215--218.
      On the existence of triangles with given lengths of one side, the opposite and an adjacent angle bisectors, 5 (2005) 21--22.
      On the existence of triangles with given circumcircle, incircle, and one additional element, 5 (2005) 165--171.
      A purely geometric proof of the uniqueness of a triangle with prescribed angle bisectors, 8 (2008) 197--200.
      (with M. Stupel) Why are the side lengths of the squares inscribed in a triangle so close to each other?, 13 (2013) 113--115.